JP2007270664A - Scroll air compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the compression efficiency and compression performance of air by suppressing the rise of temperature on an intake passage side. <P>SOLUTION: In this scroll air compressor, a passage block part 7 is formed integrally with the outer peripheral side of a fixed scroll 3. The passage block part 7 comprises an intake passage 17 one side of which is formed in a projecting pipe part 17A projecting to the outside and the other side of which is communicated with a compression chamber 16 on the outer diameter side, a discharge passage 19 communicating with a compression chamber 16 on the inner diameter side and discharging compressed air, and a supply and discharge passage 23 for supplying and discharging the compressed air from the discharge passage 19 to and from an air dryer 28. A discharging solenoid valve 27 positioned near the intake passage 17 and discharging (releasing) the discharge air discharged from the air suspension 33 side through the air dryer 28 from the projecting pipe part 17A of the intake passage 17 to the atmosphere is installed on the outer surface of the passage block part 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a scroll-type air compressor configured to be mounted on a vehicle such as a four-wheeled vehicle, and more particularly to a scroll-type air that is preferably used for supplying and discharging compressed air for adjusting a vehicle height to an air suspension or the like. It relates to a compressor.

  In general, an air suspension mounted on a vehicle as a vehicle height adjusting device suppresses a change in the vehicle height (vehicle height) according to, for example, a change in load weight, and increases the vehicle height according to a driver's preference. In order to adjust appropriately, compressed air is supplied and discharged from an on-vehicle air compressor (air compressor).

  And as a vehicle-mounted air compressor used for such an air suspension or the like, a reciprocating air compressor configured to compress air by reciprocating a piston in a cylinder is generally used ( For example, see Patent Documents 1, 2, and 3).

  Further, as another air compressor, for example, by turning the orbiting scroll with respect to the fixed scroll by a driving source such as an electric motor, air is continuously supplied in a plurality of compression chambers formed between the lap portions of both scrolls. There is also known a scroll compressor configured to compress (see, for example, Patent Document 4).

Japanese Patent Laid-Open No. 11-264375 JP 2000-104662 A JP 2004-204711 A JP-A-10-47264

  By the way, in the prior art according to Patent Documents 1 to 3 described above, since a reciprocating compressor is used as an in-vehicle air compressor, a relatively large operating noise is generated during a compression operation in which a piston reciprocates in a cylinder. However, there is a problem that the operating sound at this time causes noise.

  On the other hand, in a scroll compressor according to another prior art (Patent Document 4), air is continuously compressed in a plurality of compression chambers formed between the lap portions of the fixed scroll and the orbiting scroll. Can be kept small, and there is an advantage of excellent quietness.

  However, the conventional scroll compressor has a structure in which an air suction port is provided on the outer peripheral side of the fixed scroll and a discharge port is provided on the center side of the fixed scroll. As the temperature rises, the intake temperature of the air increases as the intake port temperature rises.

  For this reason, the air sucked into the compression chamber from the suction port is thermally expanded as the temperature rises, and the amount of sucked air (air density) is reduced by this thermal expansion, and the compression efficiency of the air There is a problem that the compression performance and the like deteriorate.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to suppress the temperature rise on the intake passage side and to improve the compression efficiency, compression performance, etc. of the air. The object is to provide an air compressor.

  Another object of the present invention is to provide a scroll-type air compressor that can supply and discharge dry compressed air to and from a pneumatic device such as an air suspension so that silence can be improved even when mounted on a vehicle. Is to provide a machine.

  In order to solve the above-described problems, the present invention provides a cylindrical casing, a fixed scroll that is fixed to the casing and has a spiral wrap portion provided on an end plate, and is opposed to the fixed scroll. The present invention is applied to a scroll type air compressor which is provided in a casing and includes a revolving scroll in which a wrap portion which is overlapped with a wrap portion of the fixed scroll and which defines a plurality of compression chambers is provided on an end plate.

  A feature of the configuration adopted by the invention of claim 1 is that the fixed scroll has an intake passage in which one side of the passage communicates with outside air and the other side of the passage communicates with a compression chamber on the outer diameter side. A discharge passage in which one side of the passage communicates with a compression chamber on the inner diameter side to discharge compressed air, a supply / exhaust passage connected to the other side of the discharge passage, and the discharge passage is discharged into the supply / exhaust passage Dryer which dries compressed air, sends it to the pneumatic equipment and regenerates it with exhaust air returned from the pneumatic equipment, one side of the passage is connected to the supply / exhaust passage at the other side of the discharge passage, and the other side of the passage is An exhaust passage connected to the intake passage, and an exhaust that is disposed in the middle of the exhaust passage and exhausts exhaust air returned from the pneumatic equipment through the dryer and the supply / exhaust passage from the intake and exhaust openings of the intake passage. To provide a valve That.

  According to the invention of claim 2, the exhaust passage is formed by branching from the other side of the discharge passage and is connected to the inflow side of the exhaust valve; and the outflow side of the exhaust valve And a second exhaust passage connected to the intake passage, and the exhaust valve communicates and blocks between the first exhaust passage and the second exhaust passage when energized from outside. It is constituted by.

  According to a third aspect of the present invention, the fixed scroll is provided with a passage block portion in which the intake passage, the discharge passage, the supply / exhaust passage and the exhaust passage are formed integrally with the end plate, and the passage block portion includes The exhaust valve is provided at a position close to the intake passage, and a portion close to the intake passage is cooled by exhaust air that is returned from the pneumatic device through the dryer to the supply / exhaust passage.

  According to a fourth aspect of the present invention, the intake passage and the supply / exhaust passage are arranged so as to cross each other in the fixed scroll.

  According to a fifth aspect of the present invention, the dryer is disposed so as to extend in the axial direction of the fixed scroll at a position opposite to the orbiting scroll across the fixed scroll, and the discharge passage and the supply / exhaust air The passage extends in the axial direction between the end plate of the fixed scroll and the dryer, the exhaust valve is provided at a position radially outside the fixed scroll, and the exhaust passage extends from the position of the supply / exhaust passage. It is set as the structure extended in the radial direction of a fixed scroll toward an exhaust valve.

  As described above, the invention according to claim 1 is provided with an intake passage, a discharge passage, a supply / exhaust passage, a dryer, an exhaust passage, and an exhaust valve in the fixed scroll, and when the exhaust valve is opened, Since the exhaust air (compressed air) discharged through the dryer, the supply / exhaust passage and the exhaust passage is exhausted to the outside from the intake / exhaust opening of the intake passage, the air suspension or the like can be used in a state where the compression operation is stopped. When exhausting used exhaust air from other pneumatic equipment with an exhaust valve, this exhaust air can be released into the atmosphere through the intake passage exhaust opening, and the air flow at this time cools the intake passage Can do.

  Therefore, when the compression operation is restarted thereafter, the air sucked into the intake passage can be kept at a low temperature, and the amount of air sucked into the compression chamber from the intake passage can be relatively increased. Thereby, the performance as a scroll type air compressor can be improved and the compression efficiency can be improved. And when a scroll type air compressor is mounted in a vehicle, dry air can be supplied and discharged via pneumatic equipment to pneumatic equipment, such as an air suspension, for example, and silence can be improved.

  In addition, when exhausting used exhaust air from pneumatic equipment such as an air suspension with an exhaust valve, the exhaust air that has been regenerated and contains a large amount of moisture flows from the supply / exhaust passage toward the exhaust passage. Even when the fixed scroll becomes hot during the compression operation and the temperature of the air supply / exhaust passage rises, when the exhaust air flows from the air supply / exhaust passage toward the exhaust passage, the moisture contained in the exhaust air is vaporized. Thus, the heat exchange action can be exhibited.

  For this reason, on the fixed scroll side, it is possible to prevent water droplets and the like from being generated in the exhaust passage and the exhaust valve, and it is possible to improve the durability and life of the exhaust valve. Moreover, since the temperature of the exhaust passage and the like can be kept relatively low by the heat exchange action as described above, air flows from the exhaust passage toward the intake passage at a lower temperature (back flow), and the entire intake passage The temperature can also be lowered. Thereby, the air amount (air density) sucked toward the compression chamber on the outer diameter side can be relatively increased, and the performance as an air compressor can be enhanced.

  According to the second aspect of the present invention, when the exhaust valve composed of the exhaust solenoid valve is opened by energization from the outside, the first exhaust path and the second exhaust path are communicated with each other, for example, air Exhaust air that flows backward from the pneumatic equipment such as a suspension into the supply / exhaust passage through the dryer is caused to flow out to the intake passage side through the first exhaust passage and the second exhaust passage, and this is discharged to the intake passage. The air can be discharged into the atmosphere through the opening for intake and exhaust. When the exhaust solenoid valve is closed, the compressed air can be prevented from flowing back in the supply / exhaust passage by shutting off the first and second exhaust passages. Can be prepared.

  In the invention according to claim 3, since the passage block portion is provided integrally with the end plate of the fixed scroll, and the exhaust valve is provided in the passage block portion at a position close to the intake passage, Of these, the portion close to the intake passage can be cooled by the exhaust air returned from the pneumatic equipment to the supply / exhaust passage through the dryer, and the portion of the passage block portion located around the intake passage rises in temperature. Can be suppressed.

  In the invention according to claim 4, by arranging the intake passage and the supply / exhaust passage so as to cross each other in the fixed scroll, the exhaust air returned from the pneumatic equipment to the supply / exhaust passage through the dryer is used. The peripheral portion of the intake passage can be cooled, and this can also suppress the temperature rise in the intake passage.

  According to the fifth aspect of the present invention, the dryer can be disposed so as to extend in the axial direction of the fixed scroll at a position opposite to the orbiting scroll across the fixed scroll. The discharge passage and the supply / exhaust passage can be arranged between the two so as to extend in the axial direction of the fixed scroll. The exhaust valve can be provided at a position radially outside the fixed scroll, and the exhaust passage can be arranged to extend in the radial direction of the fixed scroll from the position of the supply / exhaust passage toward the exhaust valve. The portion on the back side of the end plate can be cooled by the exhaust air returned from the pneumatic equipment to the supply / exhaust passage and the exhaust passage through the dryer. In addition, exhaust air that has been regenerated by the dryer and contains a large amount of moisture is heat-exchanged so that moisture is vaporized by heat from the end plate side of the fixed scroll while circulating in the exhaust passage, Problems such as moisture adhering can be solved.

  Hereinafter, a case where a scroll type air compressor according to an embodiment of the present invention is used as an in-vehicle air compressor will be described as an example with reference to the accompanying drawings.

  1 to 4 show a first embodiment of the present invention. In the figure, 1 is a scroll type air compressor (hereinafter referred to as a compressor 1), 2 is a casing that forms the outer shell of the compressor 1, and the casing 2 is a bottomed cylindrical body that is open on one side in the axial direction. It is formed as. The casing 2 is provided with a later-described electric motor 12 at a position on the other side in the axial direction.

  Reference numeral 3 denotes a fixed scroll provided on one side of the casing 2, and the fixed scroll 3 is formed using, for example, a metal material such as aluminum or an alloy material thereof. As shown in FIG. 3, the fixed scroll 3 includes a disc-shaped end plate 4, a spiral wrap portion 5 erected in the axial direction from the surface of the end plate 4, and the wrap portion 5 taken from the outside. It is generally constituted by a cylindrical support portion 6 provided on the outer peripheral side of the end plate 4 so as to surround.

  The fixed scroll 3 is integrally provided with a passage block portion 7 that protrudes outward from the outer peripheral side of the end plate 4 and the support portion 6 and is formed as a rectangular block. In the passage block portion 7, an intake passage 17, a discharge passage 19, a supply / exhaust passage 23, an exhaust passage 24, and the like, which will be described later, are formed. An air dryer 28 (described later) is detachably attached to the outer surface of the passage block portion 7 on the discharge passage 19 side, and an exhaust solenoid valve 27 is detachably attached to the exhaust passage 24 side.

  On the other hand, the end plate 4 of the fixed scroll 3 is provided with a large number of radiating fins 4A, 4A,... On the back side thereof, and these radiating fins 4A are parallel to each other and extend in the horizontal direction as shown in FIG. Yes. And these radiation fins 4A increase the contact area (cooling area) with the cooling air which distribute | circulates the outer side, and cool the end plate 4 of the fixed scroll 3 from the back side.

  Reference numeral 8 denotes a orbiting scroll provided in the casing 2 so as to be capable of turning in opposition to the fixed scroll 3, and the turning scroll 8 is formed using a metal material or the like substantially the same as that of the fixed scroll 3. As shown in FIG. 1, the orbiting scroll 8 includes a disc-shaped end plate 9, and a spiral wrap portion 10 erected in the axial direction from the surface of the end plate 9 toward the end plate 4 of the fixed scroll 3. The boss portion 11 is provided at the center of the rear surface of the end plate 9 and is connected to a drive shaft 13 described later.

  An electric motor 12 is provided on the other side of the casing 2 as a driving source. The electric motor 12 is fixedly attached to the casing 2 as shown in FIG. 1 and extends in a direction substantially parallel to an air dryer 28 described later. ing. The electric motor 12 rotates a drive shaft 13, which will be described later, by external power feeding.

  A drive shaft 13 is rotatably provided in the casing 2 via a bearing or the like. The drive shaft 13 is attached to the output shaft (not shown) of the electric motor 12 at the base end side as shown in FIG. The motor 12 is rotationally driven by the electric motor 12. Further, the boss portion 11 of the orbiting scroll 8 is connected to the front end side of the drive shaft 13 via an orbiting bearing 14 and the like so as to be orbitable.

  As a result, when the drive shaft 13 rotates, the orbiting scroll 8 is driven to rotate with a constant orbiting radius about the axis. A plurality of anti-rotation mechanisms 15 (only one is shown) are provided between the casing 2 and the back side of the orbiting scroll 8, and the orbiting scroll 8 is rotated by the anti-rotation mechanism 15 during rotation operation. Is prevented.

  Here, the wrap portion 10 of the orbiting scroll 8 is disposed so as to overlap the wrap portion 5 of the fixed scroll 3 with a shift of 180 degrees, for example. A plurality of compression chambers 16 are defined between the wrap portions 5 and 10 from the outer diameter side (outer peripheral side) to the inner peripheral side (inner diameter side).

  Reference numeral 17 denotes an intake passage provided in the passage block portion 7 of the fixed scroll 3. The intake passage 17 is upward and downward (in the radial direction of the end plate 4 having a disk shape) as shown in FIGS. The protruding tube portion 17 </ b> A is formed as an intake / exhaust opening that extends and protrudes upward from the passage block portion 7. The other side of the intake passage 17 is a suction port 17B that communicates with the outer diameter side compression chamber 16, and outside air (air) is sucked into the outer diameter side compression chamber 16 from the suction port 17B. And this air is continuously compressed in each compression chamber 16, and is discharged toward the exterior from the discharge outlet 18 mentioned later.

  Reference numeral 18 denotes a discharge port provided on the center side of the fixed scroll 3. The discharge port 18 discharges compressed air from the compression chamber 16 on the inner diameter side (center side) of the plurality of compression chambers 16 toward the outside. Is. And the discharge outlet 18 is connected to the air dryer 28 via the below-mentioned discharge piping 20 grade | etc.,.

  Reference numeral 19 denotes a discharge passage provided in the fixed scroll 3. The discharge passage 19 is formed by being bent in a substantially L shape, and one side (lower end side) is connected to the discharge port 18 from the back side of the end plate 4. The pipe 20 and the other side (upper end side) of the discharge pipe 20 are connected to each other, and a valve housing hole 21 in which a check valve 22 described later is housed. The valve accommodating hole portion 21 of the discharge passage 19 is disposed at a position radially outward with respect to the end plate 4 of the fixed scroll 3 and is formed so as to extend in the passage block portion 7 substantially parallel to the intake passage 17. ing.

  22 is a check valve provided in the passage block portion 7 of the fixed scroll 3. The check valve 22 is accommodated in the valve accommodation hole portion 21 of the passage block portion 7 as shown in FIG. The valve spring 22A is always urged toward the upper end side end face. The check valve 22 allows compressed air to flow from the discharge pipe 20 into the valve accommodating hole 21 and prevents a reverse flow. That is, the check valve 22 maintains a closed state for exhaust air discharged in a reverse direction from a supply / exhaust passage 23 described later, and distributes the exhaust air toward an exhaust passage 24 described later.

  Reference numeral 23 denotes an air supply / exhaust passage provided in the passage block portion 7 of the fixed scroll 3, and the air supply / exhaust passage 23 branches from the valve accommodating hole portion 21 of the discharge pipe 20 in the radial direction (substantially vertical direction). It is formed as a passage hole extending linearly toward the connection port 29A of the air dryer 28 (dryer case 29).

  That is, the supply / exhaust passage 23 is formed as a passage hole extending in a substantially T shape as shown in FIG. 3 with respect to the valve accommodating hole 21 and the exhaust passage 25 described later in the passage block portion 7 of the fixed scroll 3. Has been. Further, the air supply / exhaust passage 23 is disposed so as to cross the intake passage 17 in the passage block portion 7 of the fixed scroll 3.

  In the air supply / exhaust passage 23, compressed air discharged from the compression chamber 16 on the inner diameter side through the discharge port 18, the discharge pipe 20, and the valve accommodating hole portion 21 flows toward an air dryer 28 described later. Further, when compressed air (exhaust air) is exhausted from the air dryer 28 as described later, the exhaust air flows backward in the supply / exhaust passage 23 and flows out toward the exhaust passage 24 described later.

  An exhaust passage 24 is provided in the passage block portion 7 of the fixed scroll 3, and the exhaust passage 24 includes a first exhaust passage 25 and a second exhaust passage 26 which will be described later. The exhaust passage 24 discharges exhaust air flowing back through an air dryer 28 and a supply / exhaust passage 23, which will be described later, from the projecting pipe portion 17A of the intake passage 17 through the exhaust solenoid valve 27, which will be described later, into the atmosphere. is there.

  Reference numeral 25 denotes a first exhaust passage provided in the passage block portion 7 of the fixed scroll 3. One side of the first exhaust passage 25 passes through the other side position (valve accommodating hole portion 21) of the discharge passage 19. It is connected to the supply / exhaust passage 23, and the other side is connected to the inflow side of an exhaust solenoid valve 27 described later.

  Reference numeral 26 denotes a second exhaust passage provided in the passage block portion 7 of the fixed scroll 3. The second exhaust passage 26 is connected to an outflow side of an exhaust solenoid valve 27 described later, and the other side is an intake passage. Branching from a midway position 17, the intermediate portion is bent in an L shape. The second exhaust passage 26 is communicated with or cut off from the first exhaust passage 25 by an exhaust solenoid valve 27.

  Reference numeral 27 denotes an exhaust solenoid valve as an exhaust valve disposed in the vicinity of the intake passage 17, and the exhaust solenoid valve 27 is configured using an electromagnetic switching valve or the like as illustrated in FIG. The exhaust solenoid valve 27 is positioned between the first and second exhaust passages 25 and 26 as shown in FIG. 2 and attached to the outer surface (upper surface side) of the passage block portion 7 in an abutting state.

  Here, the exhaust solenoid valve 27 is disposed at a position as close as possible to the protruding pipe portion 17A of the intake passage 17, and protrudes substantially parallel to the protruding pipe portion 17A from the outer surface of the passage block portion 7. The exhaust solenoid valve 27 has an air inflow portion 27A connected to the first exhaust passage 25 and an air outflow portion 27B connected to the second exhaust passage 26.

  The exhaust solenoid valve 27 is in a closed state until power is supplied from the outside, blocking between the inflow portion 27A and the outflow portion 27B, and between the first exhaust passage 25 and the second exhaust passage 26. Prevent air from flowing between them. On the other hand, when the exhaust solenoid valve 27 is opened by power supply from the outside, the inflow portion 27A and the outflow portion 27B are communicated, and the first exhaust passage 25 to the second exhaust passage 26 and the intake passage 17 are connected. The compressed air is allowed to be discharged toward the protruding tube portion 17A.

  Reference numeral 28 denotes an air dryer as a dryer connected to the air supply / exhaust passage 23 of the passage block portion 7. The air dryer 28 includes a dryer case 29 made of a hollow sealed container, and partition plates 30 </ b> A and 30 </ b> B in the dryer case 29. And a moisture adsorbent 31 made of a desiccant such as silica gel and the like accommodated via the like.

  Here, the dryer case 29 of the air dryer 28 has a connection port 29A on one side connected to the passage block portion 7 of the fixed scroll 3 by means such as screwing, and the air dryer 28 is connected to a drive source (electric It is arranged to extend in parallel with the motor 12) in the same direction. Further, the connection port 29 </ b> A of the dryer case 29 communicates with the supply / exhaust passage 23 and extends in the same direction as the supply / exhaust passage 23.

  Further, on the other side of the dryer case 29, a supply / discharge port 29B that supplies / discharges compressed air in a dry state toward an air suspension 33 described later is provided. The supply / discharge port 29B of the dryer case 29 is connected to a plurality of air suspensions 33 (only one is shown) via an air pipe 32 as shown in FIG.

  The air dryer 28 adsorbs moisture by bringing the compressed air into contact with the internal moisture adsorbent 31 when compressed air flows from the connection port 29A of the dryer case 29 toward the supply / discharge port 29B side. The dried compressed air is supplied toward the air suspension 33 described later.

  On the other hand, when the compressed air is discharged from the air suspension 33, the dried compressed air flows backward from the supply / discharge port 29B side of the dryer case 29 toward the connection port 29A, so that moisture is desorbed from the moisture adsorbent 31 by the dry air. The adsorbent 31 is regenerated so that moisture can be adsorbed again.

  Reference numeral 33 denotes an air suspension as a pneumatic device mounted on the vehicle. The air suspension 33 is provided between the vehicle axle side and the vehicle body side (both not shown). In total, four are arranged on the front wheel side and the rear wheel side. As shown in FIG. 4, the air suspension 33 is formed with an air chamber 33C between the cylinder 33A and the piston rod 33B. The air chamber 33C is connected to the front end side of the air pipe 32 via a supply / discharge control valve 34. Connected.

  Here, the air suspension 33 supplies and discharges compressed air from the compressor 1 into the air chamber 33C through the air dryer 28, the air pipe 32, and the like. The air suspension 33 adjusts the vehicle height by moving the vehicle body up and down with the piston rod 33B when the air chamber 33C is expanded or contracted.

  A control unit 35 is constituted by a microcomputer or the like. The control unit 35 has an input side connected to a vehicle height detector (not shown) or the like, and an output side connected to the electric motor 12 and the exhaust solenoid valve 27. It is connected to the exhaust control valve 34 and the like. The control unit 35 performs control processing for supplying or discharging compressed air into the air chamber 33C of the air suspension 33 as vehicle height adjustment processing described later.

  Reference numeral 36 denotes a suction filter provided on the suction side of the compressor 1, and the suction filter 35 is detachably attached to the protruding pipe portion 17A of the intake passage 17 as shown in FIG. The suction filter 36 removes foreign matters such as dust contained in the outside air and allows clean air to flow into the intake passage 17 when the compressor 1 sucks outside air into the intake passage 17.

  The scroll type air compressor 1 according to the present embodiment has the above-described configuration, and next, vehicle height adjustment processing by the control unit 35 will be described.

  First, when controlling the vehicle height to be increased by the air suspension 33, the electric motor 12 is driven by a signal from the control unit 35 to operate the compressor 1. Thereby, the orbiting scroll 8 of the compressor 1 orbits with respect to the fixed scroll 3, and each compression chamber 16 between both is reduced continuously.

  Further, the exhaust solenoid valve 27 mounted on the passage block portion 7 of the fixed scroll 3 is held in a closed state by a signal from the control unit 35. For this reason, the exhaust solenoid valve 27 can block the air from flowing back in the intake passage 17 and the supply / exhaust passage 23 of the fixed scroll 3 by blocking between the first and second exhaust passages 25 and 26. Smooth compression operation can be compensated. Further, the supply / exhaust control valve 34 is in a communication (opened) state by a signal from the control unit 35, and air can flow in and out between the air pipe 32 and the air chamber 33C.

  As described above, when the compression operation is started, the intake passage 17 provided in the passage block portion 7 causes the outside air to be compressed from the protruding tube portion 17A and the suction filter 36 (see FIG. 4) side. Inhale inward. The air at this time is continuously compressed in each compression chamber 16, and the compressed air is discharged from the discharge port 18 on the center side toward the discharge pipe 20 of the discharge passage 19.

  When compressed air is discharged from the discharge pipe 20 of the discharge passage 19 into the valve accommodating hole 21, the check valve 22 provided in the valve accommodating hole 21 is opened by the compressed air. As a result, the compressed air flows from the air supply / exhaust passage 23 into the air dryer 28 and is brought into contact with the moisture adsorbent 31 in the dryer case 29 so that moisture is adsorbed to become dried compressed air. 33 is supplied.

  Therefore, as shown in FIG. 4, the air suspension 33 is supplied with compressed air from the compressor 1 into the air chamber 33C via the air dryer 28, the air pipe 32, etc. The vehicle height is adjusted so as to extend upward from the cylinder 33A and raise the vehicle body.

  The compressed air supplied into the air chamber 33C of the air suspension 33 is cooled by the air flow that flows around the air suspension 33 when the vehicle travels. For this reason, the compressed air filled in the air chamber 33C has a sufficiently low temperature as compared with the compressed air discharged from the discharge pipe 20 side, for example.

  On the other hand, when controlling the vehicle height to be lowered, the electric motor 12 is stopped by a signal from the control unit 35 and the operation of the compressor 1 is stopped, and the exhaust solenoid valve 27 and the supply / discharge control valve 34 are turned off. Switch to the open position. Thus, the exhaust solenoid valve 27 communicates between the inflow portion 27A and the outflow portion 27B, and the first exhaust passage 25 and the second exhaust passage 26 provided in the passage block portion 7 of the fixed scroll 3 are mutually connected. Communicate.

  For this reason, used compressed air (exhaust air having a low temperature) flows from the air chamber 33 </ b> C of the air suspension 33 in the direction of flowing back into the air dryer 28 via the air pipe 32. Then, in the air dryer 28, the dried compressed air flows in the reverse direction, so that moisture is desorbed from the moisture adsorbent 31, and the adsorbent 31 is regenerated so as to be able to adsorb moisture again.

  Then, compressed air containing moisture is discharged from the air dryer 28 toward the supply / exhaust passage 23. However, in this case, since the check valve 22 is closed, the compressed air flows out from the first exhaust passage 25 into the second exhaust passage 26 via the opened exhaust solenoid valve 27, and The compressed air is discharged or discharged into the atmosphere through the protruding pipe portion 17A of the intake passage 17 and the suction filter 36 (see FIG. 4).

  As described above, the exhaust solenoid valve 27 is temporarily opened while the compressor 1 is stopped, whereby used compressed air having a low temperature is externally (in the atmosphere) from the air chamber 33C of the air suspension 33. The air chamber 33C can be reduced and the piston rod 33B can be reduced in the cylinder 33A to adjust the vehicle height in the direction of lowering the vehicle body.

  Further, when the exhaust (exhaust air) at this time is discharged into the atmosphere from the protruding pipe portion 17A of the intake passage 17 through the suction filter 36, for example, dust in the air attached to the suction filter 36 during the compression operation. Etc. can be removed so as to blow off, and the suction filter 36 can be automatically regenerated (cleaned).

  Thus, according to the present embodiment, the passage block portion 7 is integrally formed on the outer peripheral side of the fixed scroll 3, and the passage block 7 has a protruding tube portion 17 </ b> A that protrudes outward, and the other side is the outer side. An intake passage 17 that communicates with the compression chamber 16 on the radial side, a discharge passage 19 that communicates with the compression chamber 16 on the inner diameter side and discharges compressed air, a supply / exhaust passage 23 that communicates with the discharge passage 19, and the supply / exhaust passage An air dryer 28 connected to the exhaust passage 24, one side connected to the air supply / exhaust passage 23 on the valve housing hole 21 side of the discharge passage 19, and the other side connected to the intake passage 17; An exhaust solenoid valve 27 that exhausts (discharges) exhaust air that is disposed and returned from the air suspension 33 through the air dryer 28 and the air supply / exhaust passage 23 to the atmosphere from the projecting pipe portion 17A of the intake passage 17. It is set to kick configuration.

  The exhaust passage 24 is formed by branching from the valve accommodating hole 21 of the discharge passage 19 and is connected to the inflow side of the exhaust solenoid valve 27 and the outflow side of the exhaust solenoid valve 27. The exhaust solenoid valve 27 is configured to communicate and block between the first and second exhaust passages 25 and 26 by energization from the outside.

  When the operation of the compressor 1 is stopped and the exhaust solenoid valve 27 is opened by energization, the first exhaust passage 25 and the second exhaust passage 26 are communicated with each other, so that the air suspension 33 can be connected to the air dryer. Exhaust air that flows back into the air supply / exhaust passage 23 via 28 or the like is caused to flow out to the midway position of the intake passage 17 via the first exhaust passage 25 and the second exhaust passage 26, and this is discharged to the intake passage 17. It can discharge | release to air | atmosphere from 17A of protruding tube parts.

  Moreover, on the air chamber 33C side of the air suspension 33, the internal compressed air can be cooled by the air flow that flows around the air suspension 33 when the vehicle is traveling, and the air is discharged from the air chamber 33C of the air suspension 33. The compressed air (exhaust air) has a sufficiently low temperature compared to the compressed air discharged from the discharge pipe 20 side.

  For this reason, when exhausting the used compressed air from the air suspension 33 by the exhaust solenoid valve 27 in a state where the operation of the compressor 1 is stopped, the temperature released from the protruding pipe portion 17A of the intake passage 17 to the atmosphere is reduced. The intake passage 17 can be cooled by the low exhaust air (air flow), and the temperatures of the suction port 17B communicating with the intake passage 17 and the compression chamber 16 on the outer diameter side can be kept low.

  Therefore, when the operation of the compressor 1 is resumed thereafter, the air sucked into the intake passage 17 can be kept at a low temperature state, and the air sucked into the compression chamber 16 on the outer diameter side from the suction port 17B. The amount (air density) can be increased relatively. Thereby, the compression efficiency as the scroll type air compressor 1 can be improved, and compression performance etc. can be improved reliably.

  In particular, when exhausted exhaust air used from the air suspension 33 is exhausted by the exhaust solenoid valve 27, the compressed air in a state in which the air dryer 28 is regenerated and contains a large amount of moisture is directed from the supply / exhaust passage 23 toward the first exhaust passage 25. Circulate.

  For this reason, even when the fixed scroll 3 becomes hot during the compression operation and the temperature of the supply / exhaust passage 23 and the like is increased, when the exhaust air flows from the supply / exhaust passage 23 toward the first exhaust passage 25, the compressed air is compressed. The heat exchange action can be exerted so as to vaporize the moisture contained therein, and the supply / exhaust passage 23 and the first exhaust passage 25 can be cooled by the heat of vaporization at this time.

  As a result, on the passage block 7 side of the fixed scroll 3, for example, water droplets can be prevented from being generated in the first and second exhaust passages 25 and 26 and the exhaust solenoid valve 27, and the durability of the exhaust solenoid valve 27 can be prevented. , Can improve the lifetime.

  In addition, since the temperatures of the supply / exhaust passage 23, the first exhaust passage 25, the second exhaust passage 26, and the like can be kept relatively low by the heat exchange action as described above, the intake passage from the second exhaust passage 26 can be performed. The air can be circulated (backflowed) at a lower temperature toward 17, and the temperature of the entire intake passage 17 can be lowered. Thereby, the air amount (air density) sucked into the compression chamber 16 on the outermost diameter side from the suction port 17B can be relatively increased, and the performance as the compressor 1 can be enhanced.

  Further, in the passage block 7 integrally formed on the outer peripheral side of the fixed scroll 3, the intake passage 17 and the supply / exhaust passage 23 are arranged so as to cross each other, so that the air supply is supplied from the air suspension 33 via the air dryer 28. The peripheral portion of the intake passage 17 can be cooled by the exhausted air returned into the exhaust passage 23, and the temperature rise in the intake passage 17 can also be suppressed by this.

  Next, FIG. 5 and FIG. 6 show a second embodiment of the present invention. In this embodiment, the same reference numerals are given to the same components as those of the first embodiment described above, and The explanation will be omitted. However, the feature of the present embodiment is that the air dryer 28 is arranged in a positional relationship perpendicular to the axis of the electric motor 12.

  In the figure, reference numeral 41 denotes a fixed scroll employed in the present embodiment. The fixed scroll 41 is configured in substantially the same manner as the fixed scroll 3 described in the first embodiment, and includes an end plate 4, a wrap portion 5, and a cylindrical shape. The support portion 6 and the passage block portion 42 are provided. However, the passage block portion 42 in this case is formed in a shape different from the passage block portion 7 described in the first embodiment.

  The exhaust solenoid valve 27 is attached to the outer surface of the passage block portion 42 at a position that is radially outward of the casing 2, and the air dryer 28 is disposed so as to protrude upward from the passage block portion 42. Yes. Thus, the air dryer 28 is disposed so as to protrude outward in the radial direction from the fixed scroll 41 of the compressor 1, and is disposed in a positional relationship perpendicular to the axis of the electric motor 12.

  43 is an intake passage provided in the passage block portion 42 of the fixed scroll 41. The intake passage 43 bends and extends in an L-shape in the passage block portion 42 as shown in FIG. A projecting tube portion 43 </ b> A is formed as an intake / exhaust opening projecting rearward from the portion 42. Further, the other side of the intake passage 43 extends inward in the radial direction, for example, toward the support portion 6 side of the fixed scroll 41, and communicates with the outermost diameter compression chamber 16 as a suction port 43B.

  Reference numeral 44 denotes a discharge passage provided in the fixed scroll 41. The discharge passage 44 is substantially the same as the discharge passage 19 described in the first embodiment, and a valve housing in which the discharge pipe 20 and the check valve 22 are housed. It is comprised by the hole part 21. FIG. However, in this case, the discharge passage 44 is connected to a later-described supply / exhaust passage 45 and a first exhaust passage 47 at different positions with respect to the valve accommodating hole portion 21.

  Reference numeral 45 denotes a supply / exhaust passage provided in the passage block portion 42 of the fixed scroll 41. The supply / exhaust passage 45 is configured in substantially the same manner as the supply / exhaust passage 23 described in the first embodiment. The valve housing hole 21 is communicated with the connection port 29A of the air dryer 28 (dryer case 29).

  However, the air supply / exhaust passage 45 in this case is formed as a short passage hole extending in the radial direction of the fixed scroll 41 (in the same direction as the valve accommodation hole portion 21) from the distal end side (the other side) of the valve accommodation hole portion 21. Yes. The air supply / exhaust passage 45 communicates with the connection port 29A of the dryer case 29 in the upward and downward directions (in the radial direction of the fixed scroll 41) as shown in FIG. The supply / exhaust passage 45 is arranged so as to intersect the intake passage 43 in the passage block portion 42 of the fixed scroll 41 together with the valve accommodating hole 21.

  An exhaust passage 46 is provided in the passage block portion 42 of the fixed scroll 41. The exhaust passage 46 is substantially the same as the exhaust passage 24 described in the first embodiment, and the first and second exhaust passages 47 are provided. , 48. However, in the present embodiment, one side of the first exhaust passage 47 is formed to branch from the valve accommodating hole 21 of the discharge passage 44 into a substantially L shape.

  In this case, the first exhaust passage 47 extends in the horizontal direction (the axial direction of the fixed scroll 41) toward the exhaust solenoid valve 27, and the tip side (the other side) is connected to the inflow portion 27A side of the exhaust solenoid valve 27. Has been. The first exhaust passage 47 is disposed so as to extend in parallel with the intake passage 43 at a position close to the intake passage 43.

  On the other hand, one side of the second exhaust path 48 is connected to the outflow portion 27 </ b> B side of the exhaust solenoid valve 27. The second exhaust path 48 is formed so that the other side portion branches from a midway position of the intake passage 43, and extends in a direction parallel to the first exhaust path 47. The second exhaust passage 48 is communicated with or cut off from the first exhaust passage 47 by the exhaust solenoid valve 27.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment, and the air sucked into the intake passage 43 from the protruding pipe portion 43A side is low. Can be kept in a temperature state.

  In the present embodiment, since the air dryer 28 is arranged in a positional relationship perpendicular to the axis of the electric motor 12, the air dryer 28 can be installed in a state far away from the electric motor 12 serving as a heat source. The influence of heat from the motor 12 can be kept small.

  Moreover, in the passage block portion 42 of the fixed scroll 41, the intake passage 43, the valve accommodating hole portion 21 of the discharge passage 44, and the supply / exhaust passage 45 are arranged so as to cross each other, and the first exhaust of the exhaust passage 46. Since the passage 47 is disposed so as to extend in parallel at a position close to the intake passage 43, the intake passage is caused by exhaust air returned from the air suspension 33 through the air dryer 28 into the supply / exhaust passage 45 and the first exhaust passage 47. The peripheral part of 43 can be cooled, and the temperature rise in the intake passage 43 can also be suppressed by this.

  Next, FIG. 7 shows a third embodiment of the present invention. In this embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. Shall. However, the feature of the present embodiment is that the air dryer 28 is arranged at a position opposite to the electric motor 12 in the axial direction.

  In the figure, 51 is a fixed scroll employed in the present embodiment, and the fixed scroll 51 is configured in substantially the same manner as the fixed scroll 3 described in the first embodiment, and includes an end plate 4, a wrap portion 5, and a cylindrical shape. The support portion 6 and the passage block portion 52 are provided. However, the passage block portion 52 in this case is formed in a shape different from that of the passage block portion 7 described in the first embodiment.

  That is, the passage block portion 52 in this case is integrally formed with the fixed scroll 51 as a rectangular parallelepiped block protruding rearward from the back side of the end plate 4. The air dryer 28 is disposed so as to protrude rearward from the rear side surface (rear surface) of the passage block portion 52. Thus, the air dryer 28 is disposed so as to protrude in the axial direction opposite to the electric motor 12 with the casing 2 of the compressor 1 and the fixed scroll 51 interposed therebetween, and the air dryer 28 and the electric motor 12 are substantially the same. It is arranged on the axis line.

  Further, an exhaust solenoid valve 27 is attached to the outer side surface of the passage block portion 52 at a position on the outer side in the radial direction of the fixed scroll 51. The exhaust solenoid valve 27 is disposed in a positional relationship that is substantially parallel to the protruding pipe portion 53A in a state of being close to the protruding pipe portion 53A of the intake passage 53 described later.

  Reference numeral 53 denotes an intake passage provided in the fixed scroll 51. The intake passage 53 extends in the radial direction (upward and downward in FIG. 7) in the support portion 6 or the passage block portion 52 of the fixed scroll 51. The one side is a protruding tube portion 53A as an opening for intake and exhaust that protrudes upward from the passage block portion 52. The other side of the intake passage 53 extends, for example, into the support portion 6 of the fixed scroll 51 in the radial direction, and communicates with the outermost diameter compression chamber 16 as a suction port 53B.

  Reference numeral 54 denotes a discharge passage provided in the fixed scroll 51. The discharge passage 54 is formed as a stepped hole extending through the passage block portion 52 in the axial direction from the back side of the end plate 4, and one side thereof is The central compression chamber 16 communicates with the discharge port 18. The other side of the discharge passage 54 is a valve housing hole 55 in which the check valve 22 is housed so that it can be opened and closed as in the first embodiment.

  Further, in this case, the valve accommodating hole 55 also serves as an air supply / exhaust passage, and the tip side (other side) is connected to the connection port 29A of the air dryer 28 (dryer case 29). The discharge passage 54 and the supply / exhaust passage (the valve accommodating hole 55) extend in the axial direction between the end plate 4 of the fixed scroll 51 and the air dryer 28. Further, the check valve 22 accommodated in the valve accommodating hole 55 can be easily maintained and inspected by detaching the connection port 29A of the air dryer 28 from the back side of the passage block 52.

  Reference numeral 56 denotes an exhaust passage provided in the passage block portion 52 of the fixed scroll 51. The exhaust passage 56 is substantially the same as the exhaust passage 24 described in the first embodiment, and the first and second exhaust passages 57 are provided. , 58. However, in the present embodiment, one side of the first exhaust passage 57 is formed to branch from the valve accommodating hole 55 of the discharge passage 54 into a substantially L shape.

  The first exhaust path 57 extends upward (in the radial direction of the fixed scroll 51) toward the exhaust solenoid valve 27, and the tip side (the other side) is connected to the inflow portion 27 </ b> A side of the exhaust solenoid valve 27. Yes. That is, the first exhaust path 57 is disposed at a position on the back side of the end plate 4 and extends from the position of the valve accommodating hole 55 toward the radially outer side of the fixed scroll 51.

  On the other hand, one side of the second exhaust path 58 is connected to the outflow portion 27 </ b> B side of the exhaust solenoid valve 27. The second exhaust path 58 is formed such that the other side portion branches from a midway position of the intake passage 53, and extends in a direction parallel to the first exhaust path 57. The second exhaust path 58 is communicated with or cut off from the first exhaust path 57 by the exhaust solenoid valve 27.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the first embodiment, and the air sucked into the intake passage 53 from the protruding pipe portion 53A side is low. Can be kept in a temperature state.

  In the present embodiment, the air dryer 28 is disposed at a position opposite to the electric motor 12 with the casing 2 of the compressor 1 and the fixed scroll 51 interposed therebetween, and the air dryer 28 and the electric motor 12 are substantially the same. Therefore, the air dryer 28 can be installed far away from the electric motor 12 serving as a heat source, and the thermal influence from the electric motor 12 can be kept small.

  Further, the exhaust solenoid valve 27 is provided at a position on the radially outer side of the passage block portion 52 in the fixed scroll 51, and the first exhaust passage 57 of the exhaust passage 56 is disposed from the position of the valve accommodating hole 55 (supply / exhaust passage). Since it is arranged so as to extend in the radial direction of the fixed scroll 51 toward the exhaust solenoid valve 27, a portion of the passage block portion 52 located on the back side of the end plate 4 is moved from the air suspension 33 through the air dryer 28. It is possible to cool the exhaust air returned into the one exhaust passage 57.

  The exhaust air that has been regenerated by the air dryer 28 and contains a large amount of moisture is subjected to heat exchange so that moisture is vaporized by heat from the end plate 4 side while flowing through the first exhaust passage 57, for example. Problems such as moisture adhering to the solenoid valve 27 can be solved.

  Moreover, the discharge passage 54 provided in the passage block portion 52 of the fixed scroll 51 can be formed as a stepped hole having a simple shape, and for example, the discharge pipe 20 described in the first embodiment can be dispensed with. In the passage block portion 52, the intake passage 53 and the first and second exhaust passages 57 and 58 can be formed in a simplified manner together with the discharge passage 54. It can be done easily.

  In the first embodiment, the case where the air suspension 33 is used as a pneumatic device for supplying and discharging compressed air has been described as an example. However, the present invention is not limited to this. For example, the compressed air may be supplied to or discharged from a pneumatic device such as an air cylinder. This also applies to the second and third embodiments.

It is a longitudinal section showing a scroll type air compressor by a 1st embodiment of the present invention. FIG. 2 is a partially broken side view of a fixed scroll passage block portion and the like as viewed from the direction of arrows II-II in FIG. 1. It is sectional drawing which expands and shows the principal part in FIG. It is a pneumatic circuit diagram which shows the circuit structure for supplying / exhausting compressed air to the air chamber of an air suspension. It is a longitudinal cross-sectional view which shows the scroll type air compressor by 2nd Embodiment. It is sectional drawing which looked at the passage block part of a fixed scroll, an air dryer, etc. from the arrow VI-VI direction in FIG. It is a longitudinal cross-sectional view which shows the scroll type air compressor by 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scroll type air compressor 2 Casing 3,41,51 Fixed scroll 4 End plate 5 Lapping part 7,42,52 Passage block part 8 Orbiting scroll 9 End plate 10 Lapping part 12 Electric motor (drive source)
13 Drive shaft 16 Compression chamber 17, 43, 53 Intake passage 17A, 43A, 53A Protruding tube (intake / exhaust opening)
19, 44, 54 Discharge passage 22 Check valve 23, 45 Supply / exhaust passage 24, 46, 56 Exhaust passage 25, 47, 57 First exhaust passage 26, 48, 58 Second exhaust passage 27 Exhaust solenoid valve (exhaust valve) )
28 Air dryer (air drying means)
33 Air suspension (pneumatic equipment)

Claims (5)

A cylindrical casing, a fixed scroll provided fixed to the casing and provided with a spiral wrap on the end plate, and a fixed scroll wrapped in the end plate provided in the casing so as to face the fixed scroll In the scroll type air compressor composed of the orbiting scroll in which the lap portion that is overlapped with the portion and defines a plurality of compression chambers is erected,
The fixed scroll has an intake passage in which one side of the passage communicates with the outside air and the other side of the passage communicates with the compression chamber on the outer diameter side, and one side of the passage communicates with the compression chamber on the inner diameter side for compression. A discharge passage for discharging air; a supply / exhaust passage connected to the other side of the discharge passage; and the compressed air discharged from the discharge passage to the supply / exhaust passage is dried and sent to a pneumatic device. A dryer regenerated by the exhaust air returned from the exhaust passage, an exhaust passage in which one side of the passage is connected to the supply / exhaust passage at the other side of the discharge passage and the other side of the passage is connected to the intake passage, A scroll type characterized by comprising an exhaust valve arranged in the middle to exhaust exhaust air returned from the pneumatic equipment through the dryer and supply / exhaust passage from an intake / exhaust opening of the intake passage. air compressor.   The exhaust passage is formed by branching from the other side of the discharge passage and is connected to the inflow side of the exhaust valve, and the second exhaust passage is connected to the intake passage at the outflow side of the exhaust valve. The exhaust valve is configured by an exhaust passage, and the exhaust valve is configured by an exhaust solenoid valve that communicates and blocks between the first exhaust passage and the second exhaust passage by energization from the outside. Scroll air compressor.   The fixed scroll is provided with a passage block portion in which the intake passage, the discharge passage, the supply / exhaust passage and the exhaust passage are formed integrally with the end plate, and the exhaust valve is located near the intake passage in the passage block portion. The scroll air compressor according to claim 1 or 2, wherein a portion close to the intake passage is cooled by exhaust air that is returned from the pneumatic equipment to the supply / exhaust passage through a dryer.   The scroll air compressor according to claim 1, 2 or 3, wherein the intake passage and the supply / exhaust passage are arranged so as to cross each other in the fixed scroll.   The dryer is disposed so as to extend in the axial direction of the fixed scroll at a position opposite to the orbiting scroll across the fixed scroll, and the discharge passage and the supply / exhaust passage include the end plate of the fixed scroll and the end plate of the fixed scroll The exhaust valve extends in the axial direction between the dryer and the exhaust valve. The exhaust valve is provided at a position radially outside the fixed scroll, and the exhaust passage extends from the position of the supply / exhaust passage toward the exhaust valve in the radial direction of the fixed scroll. The scroll type air compressor according to claim 1, 2, or 3, wherein the scroll type air compressor is configured to extend in a line.

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