JP2020133404A - Air compression apparatus - Google Patents

Abstract

To provide an air compression apparatus which can efficiently cool a supply device which supplies electric power to a motor in cooling of the supply device.SOLUTION: An air compression apparatus 100 includes: a compressor 10 which compresses air suctioned from a suction passage and sends the compressed air to a delivery passage; a motor 12 which drives the compressor; a supply device 40 which supplies electric power for driving to the motor; and a cooling part 42 which is provided in at least a part of the suction passage or at least a part of the delivery passage and cools the supply device.SELECTED DRAWING: Figure 1

Description

The present invention relates to an air compressor.

An air compressor that produces compressed air is known. For example, Patent Document 1 describes a packaged compressor having a compressor body driven by an electric motor. This compressor includes a compressor main body that compresses air, a motor that drives the compressor main body, an inverter that controls the rotation speed of the motor, and a cooling fan provided in the compressor main body. The inverter is provided in the intake path of the cooling air by the cooling fan.

Japanese Unexamined Patent Publication No. 2016-075159

The present inventors have obtained the following recognition about the air compressor.
Electronic components such as switching power supplies and smoothing capacitors that make up a supply device that supplies electric power to a motor, such as an inverter, generate heat by themselves during operation. It is desirable that the supply device be cooled in order to suppress the temperature rise of the electronic components. In the compressor described in Patent Document 1, an inverter is arranged in a duct, and the inverter is cooled by passing air sucked from a suction port of a housing through a cooling fan provided in the compressor main body in the duct. ing. Although the supply device is required to be efficiently cooled for miniaturization and the like, the compressor described in Patent Document 1 cannot be said to sufficiently realize this requirement.
From these, the present inventors recognized that there is room for improvement in the air compression device from the viewpoint of efficiently cooling the supply device.

The present invention has been made in view of these problems, and one object of the present invention is to provide an air compressor capable of efficiently cooling a supply device that supplies electric power to a motor.

In order to solve the above problems, the air compressor of an embodiment of the present invention is driven by a compressor that compresses the air sucked from the suction path and sends it to the delivery path, a motor that drives the compressor, and a motor. It is provided with a supply device for supplying power and a cooling unit provided in at least a part of a suction path or at least a part of a delivery path to cool the supply device.

It should be noted that any combination of the above, and those in which the components and expressions of the present invention are mutually replaced between methods, devices, programs, temporary or non-temporary storage media on which programs are recorded, systems, and the like are also used. It is effective as an aspect of the present invention.

According to the present invention, it is possible to provide an air compression device capable of efficiently cooling a supply device that supplies electric power to a motor.

It is a system diagram which shows typically the structure of the air compression apparatus which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows the state which the air compression device of FIG. 1 is installed in a railroad vehicle. It is a side sectional view schematically showing the periphery of the compressor drive part and the multi-blade fan of the air compressor of FIG. FIG. 3 is an enlarged side sectional view showing the periphery of the labyrinth portion of the compressor drive portion of FIG. It is a perspective view which shows the periphery of the inverter control device of the air compression device of FIG. It is a front view which shows the balance weight and the multi-blade fan of the compressor drive part of FIG. It is a rear view which shows the balance weight and the multi-blade fan of the compressor drive part of FIG. It is a front view which shows typically the compressor and the blower fan of the air compression device of FIG. It is another front view which shows typically the compressor and the blower fan of the air compressor of FIG. It is a figure which shows schematic the flow of the air from the blower fan of FIG. It is a perspective view which shows typically the cooler of the air compression device of FIG. It is a schematic diagram explaining the air flow of the cooler of FIG. It is a system diagram which shows typically the structure of the air compression apparatus which concerns on 2nd Embodiment of this invention. It is a front view which shows roughly the periphery of the compressor of the air compressor which concerns on 1st modification.

Hereinafter, the present invention will be described with reference to each drawing based on a preferred embodiment. In the embodiments and modifications, the same or equivalent components and members are designated by the same reference numerals, and redundant description will be omitted as appropriate. In addition, the dimensions of the members in each drawing are shown enlarged or reduced as appropriate for easy understanding. In addition, some of the members that are not important for explaining the embodiment in each drawing are omitted and displayed.
Also, terms including ordinal numbers such as 1st and 2nd are used to describe various components, but this term is used only for the purpose of distinguishing one component from other components. The components are not limited by.

[First Embodiment]
The configuration of the air compression device 100 according to the first embodiment of the present invention will be described with reference to the drawings. As an example, the air compressor 100 is provided under the floor of a railroad vehicle and can be used as an air compressor for railroad vehicles that supplies compressed air to the vehicle. FIG. 1 is a system diagram schematically showing the configuration of the air compression device 100. FIG. 2 is a schematic view showing a state in which the air compression device 100 is installed in the railway vehicle 90. In this figure, in order to facilitate understanding, a part of the bearing holder 38 and the multi-blade fan 16 is broken, and the blower fan 28 is shown to be smaller than the actual ratio.

The air compressor 100 of the present embodiment includes a compressor 10, a compressor drive unit 14, a multi-blade fan 16, a cooler 22, a dehumidifier 24, an air introduction unit 26, a blower fan 28, and air. It includes a suction unit 32, a compressed air delivery unit 34, an inverter control device 40, and a storage case 36. The air compressor 100 compresses the air sucked from the air suction unit 32 with the compressor 10, cools it with the cooler 22, dehumidifies it with the dehumidifier 24, sends it out from the compressed air delivery unit 34, and supplies it to the vehicle 90. ..

The compressor drive unit 14 drives the compressor 10. The inverter control device 40 drives the motor 12 of the compressor drive unit 14. The multi-blade fan 16 is driven by a motor 12 to generate an air flow used for cooling by the cooler 22. The air introduction unit 26 introduces compressed air into the motor 12, and the blower fan 28 generates an air flow that cools the compressor 10.

Hereinafter, the direction along the central axis La of the rotating shaft 10a of the compressor 10 is referred to as "axial direction", and the circumferential direction and radial direction of the circle centered on the central axis La are "circumferential direction" and "diameter", respectively. Direction. " Further, hereinafter, for convenience, one side in the axial direction (right side in the figure) is referred to as an input side, and the other side (left side in the figure) is referred to as a non-input side. In this example, the motor 12 is provided on the input side of the compressor 10, and the compressor 10 is provided on the opposite side of the motor 12.

The air suction unit 32 is installed in the storage case 36 and functions as a mechanism for sucking the air (outside air) compressed by the compressor 10. The air suction portion 32 is formed so as to communicate with the compressor 10 through the suction pipe 32b. The air suction portion 32 is provided with a suction filter 32a that suppresses the passage of dust such as dust when the suction air passes. The suction filter 32a may be a filter using a mesh.

The compressed air delivery unit 34 functions as a mechanism for delivering the compressed air Ar10d cooled by the cooler 22 described later and dehumidified by the dehumidifier 24. The compressed air delivery unit 34 supplies the generated compressed air Ar10d to the compressed air reservoir 92 installed outside the accommodation case 36.
The compressed air delivery unit 34 may include a valve mechanism 34d provided in a path communicating the dehumidifier 24 and the compressed air reservoir 92. The valve mechanism 34d may be a check valve that allows the compressed air Ar10d to pass through the compressed air reservoir 92 and prevents backflow from the compressed air reservoir 92 when the dehumidifier 24 side has a predetermined pressure or higher.

The compressor drive unit 14 will be described with reference to FIGS. 2, 3, and 4. FIG. 3 is a side sectional view schematically showing the periphery of the compressor drive unit 14 and the multi-blade fan 16. FIG. 4 is an enlarged side sectional view showing the periphery of the labyrinth portion 12f of the compressor drive unit 14. The compressor drive unit 14 mainly includes a motor 12 that rotationally drives the compressor 10 and a balance weight 15.

The motor 12 will be described. The motor 12 includes an output shaft 12a, a rotor 12k, a stator 12s, a casing 12c, and a labyrinth portion 12f. In the present embodiment, the output shaft 12a of the motor 12 is provided integrally with the rotation shaft 10a of the compressor 10. The rotor 12k has a magnet 12m having a plurality of magnetic poles in the circumferential direction, and is fixed to the outer periphery of the output shaft 12a. The rotor 12k is fixed to the input side of the rotor fixing portion 15d of the balance weight 15 described later by a fastener such as a bolt (not shown). An adhesive may be used in combination for these fixings.

The stator 12s has a stator core 12j that surrounds the rotor 12k via a magnetic gap, and a coil 12g wound around the stator core 12j. The outer peripheral portion of the stator 12s is fixed to the inner peripheral surface of the casing 12c. The casing 12c has a tubular portion 12d and a bottom portion 12e, and functions as an outer shell that surrounds the rotor 12k and the stator 12s. In this example, the casing 12c has a bottomed cylindrical shape with the non-input side open and the bottom 12e provided on the input side. The bottom portion 12e is provided with an introduction port 12h for taking in air from the air introduction portion 26.

The labyrinth portion 12f is provided so as to cover the counter-input side of the tubular portion 12d, and in this example, has a disk shape. The labyrinth portion 12f includes a rotating body portion 12n fixed to the output shaft 12a and a stationary body portion 12p fixed to the tubular portion 12d. The stationary body portion 12p is a donut-shaped disk member provided with a stationary body side labyrinth forming portion 12q on the outer peripheral portion of the end surface on the non-input side. The stationary body side labyrinth forming portion 12q has a stationary body side concave portion 12t and a stationary body side convex portion 12u. The labyrinth convex portion 15h, which will be described later, enters the stationary body side concave portion 12t. The stationary body side convex portion 12u enters the labyrinth recess 15g described later. The stationary body side convex portion 12u is an annular wall provided around the inner peripheral side of the stationary body side concave portion 12t. The rotating body portion 12n also serves as a balance weight 15 described later. A labyrinth 12r is provided between the rotating body portion 12n and the stationary body portion 12p. In this example, the labyrinth 12r is a maze that combines bending gaps. The labyrinth portion 12f has the labyrinth 12r to reduce the intrusion of dust into the motor 12.

Further, since the compressed air Ar10e introduced from the introduction port 12h flows from the labyrinth 12r to the outside, the dust of the labyrinth 12r is easily discharged to the outside by this air flow.

The motor 12 generates a field magnetic field in the magnetic gap by supplying a drive current from the inverter control device 40 (drive circuit) described later to the coil 12 g of the stator 12s. The motor 12 generates a rotational driving force in the rotor 12k and the output shaft 12a by the action of the field magnetic field and the magnet 12m of the rotor 12k. The rotational driving force of the output shaft 12a drives the multi-blade fan 16 and the compressor 10 through the rotary shaft 10a. The bearing that supports the rotating shaft 10a is provided in the bearing holder 38 outside the compressor drive unit 14, and is not provided inside the compressor drive unit 14.

The cooling unit 42 and the inverter control device 40 will be described with reference to FIGS. 1, 2, and 5. FIG. 5 is a perspective view showing the periphery of the inverter control device 40. In this figure, in order to see the inside, the upper plate is removed and a part of the facing wall 42b is cut out. As shown in FIG. 5, the cooling unit 42 of the present embodiment functions as a storage box for accommodating the inverter control device 40. The cooling unit 42 protects the inverter control device 40 from dust or rainwater by accommodating the inverter control device 40. The cooling unit 42 of the present embodiment is a rectangular parallelepiped shaped metal box in which six surfaces are sealed, and has facing walls 42b and 42d facing each other.

As shown in FIGS. 1 and 2, the cooling unit 42 is provided in the suction path of the suction air Ar32, and the suction air Ar32 is introduced from the suction path. In particular, the cooling unit 42 is provided on the path between the air suction unit 32 and the suction port 10c of the compressor 10. That is, a filter 32a that suppresses the passage of dust is provided upstream of the cooling unit 42. Further, a valve mechanism 32d (check valve) that allows air to flow to the compressor 10 is provided downstream of the cooling unit 42.

The inverter control device 40 functions as a supply device that supplies driving power to the motor 12 that drives the compressor 10. As shown in FIG. 5, the inverter control device 40 includes an electronic component 40p, a printed wiring board 40b, and a heat sink 40h. The electronic component 40p is a switching power module, a smoothing capacitor, or the like that supplies a drive current to the coil 12g of the motor 12. The printed wiring board 40b electrically connects the electronic components 40p to realize a predetermined electronic circuit and supports the electronic components 40p.

Since the electronic component 40p self-heats during operation, the temperature inside the cooling unit 42 rises. When the temperature inside the box rises, the internal temperature of the electronic component 40p rises in combination with self-heating, which shortens the life and causes a failure. Therefore, the inverter control device 40 has a heat sink 40h for cooling the electronic component 40p. The heat sink 40h may be arranged at least a part of the suction path or at least a part of the delivery path.

Although the heat sink 40h is not limited, the heat sink 40h in this example includes a flat plate-shaped base 40e attached to the printed wiring board 40b and a plurality of fins 40f protruding from the base 40e to the opposite side of the printed wiring board 40b. And have. The heat generated in the electronic component 40p is transferred to the base 40e and the plurality of fins 40f via the wiring board 40b.

The cooling unit 42 is provided with an inlet portion 42p for introducing the suction air Ar32 and an outlet portion 42s for discharging the suction air Ar32. The suction air Ar32 is introduced from the inlet portion 42p and discharged from the outlet portion 42s, so that the cooling portion 42 is forcibly ventilated, the temperature rise in the cooling portion 42 is suppressed, and the internal temperature of the electronic component 40p is lowered. ..

The suction air Ar32 introduced into the cooling unit 42 forms an air flow flowing from the inlet portion 42p to the outlet portion 42s. It is desirable that the flow path resistance of the air flow is small. Therefore, in the present embodiment, the inlet portion 42p is provided on one facing wall 42b, and the exit portion 42s is provided on the other facing wall 42d. In particular, the inlet portion 42p and the outlet portion 42s are arranged at positions facing each other so that the distance between them is minimized. In the example of FIG. 5, the inlet portion 42p and the outlet portion 42s are arranged at the center of the facing walls 42b and 42d in the width direction.

In order to promote heat dissipation of the heat sink 40h, it is desirable that an air flow passes through the surfaces of the base 40e and the fins 40f. Therefore, in the present embodiment, the heat sink 40h is arranged in the flow path of the air flow in the cooling unit 42. In particular, the heat sink 40h is arranged so that its heat radiating surface 42m comes into contact with the air flow in the storage box. In the example of FIG. 5, the base 40e and the fins 40f extend in the direction of the air flow of the cooling unit 42 and are arranged so as not to obstruct the air flow. Specifically, the heat radiating surface 42m of the base portion 40e and the fin 40f is made substantially parallel to the line connecting the inlet portion 42p and the outlet portion 42s along the air flow. In particular, the two fins 42f are arranged so as to sandwich the line connecting the inlet portion 42p and the outlet portion 42s, and the main flow of the air flow (main large flow) passes between the two fins 42f. It is sandwiched between 42f.

The multi-blade fan 16 will be described with reference to FIGS. 3, 4, 6, and 7. FIG. 6 is a front view showing a multi-blade fan 16 fixed to the balance weight 15. FIG. 7 is a rear view showing a multi-blade fan 16 fixed to the balance weight 15. The multi-blade fan 16 is arranged axially between the compressor 10 and the motor 12. The multi-blade fan 16 functions as a fan that rotates integrally with the rotor 12k of the motor 12. In particular, the multi-blade fan 16 functions as a blower that collects and sends out the airflow generated from the central portion to the outer peripheral portion in the delivery duct 16d. The multi-wing fan 16 is sometimes referred to as a sirocco fan. The multi-blade fan 16 includes a disk portion 16b and a plurality of blades 16c.

The disk portion 16b is a donut-shaped disk member whose inner peripheral side is fixed to the rotating shaft 10a via a balance weight 15. In particular, the disk portion 16b is fixed to the fan fixing portion 15c provided on the end face on the opposite side of the balance weight 15 by a fastener such as a bolt (not shown). An adhesive may be used in combination for these fixings. The plurality of blades 16c extend from the disk portion 16b to the opposite side in the vicinity of the outer circumference of the disk portion 16b. The plurality of blades 16c are arranged at predetermined angles in the circumferential direction. The plurality of blades 16c function as an air flow generating unit that generates an air flow toward the outer peripheral portion by rotating. The casing 16e is a cylindrical member that surrounds the disk portion 16b and the plurality of blades 16c.

As shown in FIG. 4, the disk portion 16b is arranged on the end surface of the motor 12 on the non-input side with an axial gap 16g interposed therebetween. The width W16 of the axial gap 16g may be narrower than the thickness H16 of the disk portion 16b. As shown in FIG. 3, in the axial direction, the blade 16c overlaps with the second bearing 13e in the axial direction.

The delivery duct 16d is a tubular member extending from the casing 16e to the cooler 22. The lower portion 16h of the delivery duct 16d is a substantially square tubular portion extending upward from the upper portion of the casing 16e. The upper portion 16j of the delivery duct 16d is a portion communicating from the upper portion of the lower portion 16h to the lower portion of the cooler 22. The upper portion 16j has a substantially quadrangular pyramid shape with a wide upper side.

The multi-blade fan 16 may axially overlap with at least a part of the bearing 38j that supports the rotating shaft 10a of the compressor 10. In this case, the axial length of the air compressor 100 can be shortened as compared with the case where the multi-blade fan 16 does not overlap with the bearing 38j.

The balance weight 15 will be described with reference to FIGS. 6 and 7. The balance weight 15 also functions as an intermediate member arranged between the rotor 12k and the multi-blade fan 16. The balance weight 15 is a metal disk-shaped member such as brass, and also serves as a rotating body portion 12n of the labyrinth portion 12f as described above. The balance weight 15 includes balance adjusting portions 15a and 15b, a fan fixing portion 15c, a rotor fixing portion 15d, a shaft fastening portion 15f, and a labyrinth forming portion 15e.

The fan fixing portion 15c is an annular portion to which the multi-blade fan 16 is fixed on the end face on the opposite side of the input. The rotor fixing portion 15d is an annular portion on the end surface on the input side to which the rotor 12k is fixed, and in this example, has a columnar outer shape protruding from the outer peripheral portion to the input side. The shaft fastening portion 15f is a through hole through which the output shaft 12a is inserted and fixed.

The labyrinth forming portion 15e is a portion on the outer peripheral portion of the input side end surface where the labyrinth recess 15g and the labyrinth convex portion 15h are provided. The labyrinth recess 15g is a peripheral recess formed on the opposite side of the labyrinth forming portion 15e. The stationary body side convex portion 12u enters the labyrinth recess 15g through the gap. The labyrinth convex portion 15h is a portion that enters the stationary body side concave portion 12t through the gap. The labyrinth convex portion 15h in this example is an annular wall provided around the outer peripheral side of the labyrinth concave portion 15g.

The balance adjusting portions 15a and 15b are portions to be processed to reduce the total unbalance amount of the balance weight 15, the rotor 12k and the multi-blade fan 16. That is, in a state where the multi-blade fan 16 and the rotor 12k are fixed and integrated with the balance weight 15, balance adjustment for reducing the total amount of these imbalances is performed on the balance adjusting portions 15a and 15b.

The balance adjusting portions 15a and 15b may be provided only on one end face of the balance weight 15, but are provided on both end faces in the present embodiment. The balance adjusting portions 15a and 15b include a fan-side adjusting portion 15a provided radially inside the fan fixing portion 15c and a rotor-side adjusting portion 15b provided radially outside the rotor fixing portion 15d. In particular, the balance adjusting portion 15a may be provided radially inside the air flow generating portion of the multi-blade fan 16. In this example, the balance adjusting portion 15a is provided radially inside the plurality of blades 16c. As shown in FIGS. 6 and 7, the balance adjusting portions 15a and 15b of this example are flat annular portions in the radial intermediate region of the balance weight 15.

The compressor 10 will be described with reference to FIGS. 2 and 8 to 10. These figures show the compressor 10 and the blower fan 28 as viewed from the arrow F in FIG. FIG. 8 is a front view schematically showing the compressor 10 and the blower fan 28. FIG. 9 shows a state in which the fixed scroll portion 10j is removed. FIG. 10 shows a back space of 10 g with the swivel scroll portion 10 h removed. The compressor 10 of the present embodiment includes a rotating shaft 10a, a body portion 10b, a suction port 10c, a discharge port 10e, an air-cooled fin 10f, a swivel scroll portion 10h, a fixed scroll portion 10j, and a back space 10g. It is a scroll type air compressor equipped with.

In the compressor 10, the suction port 10c communicates with the air suction portion 32, and the air Ar32 sucked from the air suction portion 32 into the pump space 10d through the suction pipe 32b is compressed. A valve mechanism 32d is provided between the air suction portion 32 and the suction port 10c of the compressor 10. The valve mechanism 32d opens when the compressor 10 operates and the compressor 10 side becomes a negative pressure. The discharge port 10e communicates with the cooler 22, and the compressed air is discharged from the discharge port 10e to the cooler 22.

The body portion 10b is a circumferential outer peripheral wall that defines the pump space 10d. The body portion 10b surrounds the fixed scroll 10m and the swivel scroll 10n in the pump space 10d. The fixed scroll portion 10j includes a fixed disk portion 10k provided with a plurality of air-cooled fins 10f on the outside and a fixed scroll 10m fixed on the inside of the fixed disk portion 10k. A discharge port 10e is provided at the center of the fixed disk portion 10k. The swivel scroll portion 10h includes a swivel disc portion 10p and a swivel scroll 10n fixed to the swivel disc portion 10p. A rotation shaft 10a extending to the input side is fixed at the center of the swivel disk portion 10p. A back space 10g is provided on the input side of the swivel disk portion 10p, that is, on the back side of the swivel scroll portion 10h. Cooling air is introduced from the blower fan 28 into the back space 10g, and the swivel disk portion 10p and the rotating shaft 10a are forcibly air-cooled. The blower fan 28 will be described later.

The swivel scroll 10n and the fixed scroll 10m are spiral bodies having the same shape. The compressor 10 changes the volume of the compression space and compresses air by rotating the swivel scroll 10n integrally with the rotation shaft 10a with respect to the fixed scroll 10m. The compressor 10 sucks air from the outer circumference and performs a compression action toward the center. The compressor 10 may be a non-lubricated type.

The blower fan 28 will be described with reference to FIGS. 2 and 8 to 10. The blower fan 28 is a blower mechanism that sends cooling air (hereinafter referred to as cooling air Ar28) to the compressor 10. The blower fan 28 supplies the cooling air Ar28 to the back space 10g on the back side of the swirling scroll portion 10h, and mainly cools the swirling scroll portion 10h.

The blower fan 28 of the present embodiment is an electric axial blower having a propeller 28b. As shown in FIG. 10, the blower fan 28 is arranged on the side of the compressor 10 so that the rotation axis L28 of the propeller 28b is orthogonal to the rotation axis 10a of the compressor 10. An outside air filter 28a formed of a wire mesh or the like is provided on the upstream side of the blower fan 28. On the downstream side of the blower fan 28, a blower duct 28 g for guiding the cooling air Ar28 to the center of the swirl scroll portion 10h is provided.

The blower duct 28g has a substantially quadrangular pyramid shape in which the cross section decreases as it approaches the compressor 10. The cooling air Ar28 is squeezed along the inner surface of the air duct 28g, and intensively cools the central portion of the swivel scroll portion 10h. Since the central portion of the swivel scroll portion 10h has the highest temperature, the cooling effect can be enhanced by intensively cooling the portion. An exhaust duct 28h is provided on the downstream side of the back space 10g. In this example, the upstream side of the exhaust duct 28h faces the air duct 28g, and the downstream side faces downward.

The cooler 22 will be described with reference to FIGS. 2, 3, 11, and 12. The cooler 22 cools the high-temperature (for example, 200 ° C. to 250 ° C.) compressed air supplied from the compressor 10 to a temperature slightly higher than room temperature (for example, 40 ° C. to 50 ° C.) and supplies it to the dehumidifier 24. .. The cooler 22 may be composed of a single cooler, but in the present embodiment, a plurality of coolers are connected in series. The cooler 22 of the present embodiment includes a first cooler 18 that primarily cools the compressed air from the compressor 10 and a second cooler 20 that secondarily cools the compressed air cooled by the first cooler 18. Be prepared.

The first cooler 18 and the second cooler 20 have bent pipes 18p and 20p, and pipe accommodating portions 18c and 20c for accommodating the pipes, respectively. The bent pipes 18p and 20p meander and have a plurality of bent portions, and compressed air flows from one end to the other end of the pipe. The pipe accommodating portions 18c and 20c have thin square tubular outer walls at the top and bottom, and function as a wind tunnel through which an air flow for cooling flows up and down.

Wire mesh portions 18m and 20m that support the bent pipes 18p and 20p are fixed to the lower portions of the pipe accommodating portions 18c and 20c. The upper surface of the pipe accommodating portion 20c is opened, and the wire mesh portion 20n is fixed to the upper surface of the pipe accommodating portion 18c. As described above, the pipe accommodating portions 18c and 20c have a configuration in which the air flow easily passes up and down.

The first introduction portion 18b provided at one end of the bent pipe 18p projects outward from the side wall of the pipe accommodating portion 18c of the first cooler 18. The first introduction unit 18b communicates with the discharge port 10e of the compressor 10. The first lead-out portion 18e provided at the other end of the bent pipe 18p projects outward from the side wall of the pipe accommodating portion 18c of the first cooler 18. The first out-licensing unit 18e communicates with the second introduction unit 20b.

The second introduction portion 20b provided at one end of the bent pipe 20p projects outward from the bottom portion of the pipe accommodating portion 20c of the second cooler 20. The second introduction unit 20b communicates with the first out-licensing unit 18e. The second lead-out portion 20e provided at the other end of the bent pipe 20p projects outward from the side wall of the pipe accommodating portion 20c of the second cooler 20. The second lead-out unit 20e communicates with the dehumidifier 24.

The pipe accommodating portion 18c is arranged above the pipe accommodating portion 20c. The air flow Ar16a sent from the multi-blade fan 16 is supplied to the lower surface of the pipe accommodating portion 20c through the duct 16d. The air flow Ar16a flows through the gap of the wire mesh portion 20m and the gap of the bent pipe 20p, and is discharged from the upper surface of the pipe accommodating portion 20c. The compressed air of the bent pipe 20p is cooled by the air flow Ar16a passing through the outer peripheral surface of the bent pipe 20p.

The air flow Ar16b discharged from the pipe accommodating portion 20c is supplied to the lower surface of the pipe accommodating portion 18c. The air flow Ar16b flows through the gap of the wire mesh portion 18m, the gap of the bent pipe 18p, and the gap of the wire mesh portion 20n, and is discharged from the upper surface of the pipe accommodating portion 18c. The compressed air Ar20c of the bent pipe 18p is cooled by the air flow Ar16b passing through the outer peripheral surface of the bent pipe 18p. The air discharged from the pipe accommodating portion 18c is diffused into the atmosphere.

In this way, the air flow Ar16a sent out from the multi-blade fan 16 is first supplied to the second cooler 20 and used for secondary cooling of the compressed air after the primary cooling. The air flow Ar16b discharged from the second cooler 20 is supplied to the first cooler 18 and is used for the primary cooling of the compressed air. Compared with the case where the air flow Ar16a is used for the primary cooling first, the temperature difference between the compressed air and the cooling air in the secondary cooling is large, so that the cooling efficiency can be increased.

The cooler 22 may be arranged anywhere as long as the desired cooling effect is obtained. The cooler 22 of the present embodiment is arranged above the center of the air compressor 100 in the vertical direction. In particular, the cooler 22 is arranged between the multi-blade fan 16 and the floor of the railroad vehicle 90. The path of the air flow Ar16a sent from the multi-blade fan 16 can be shortened to save extra piping space. Further, the front-rear length of the air compressor 100 can be shortened as compared with the case where the multi-blade fan 16 is arranged in the front-rear direction.

The dehumidifier 24 is provided in a path communicating the cooler 22 and the compressed air delivery unit 34. The dehumidifier 24 is a hollow fiber membrane type dehumidifier that dehumidifies the cooled compressed air Ar10c. The dehumidifier 24 may include a filter element containing a desiccant. In the dehumidifier 24, the final dehumidification of the compressed air Ar10d delivered from the compressed air delivery unit 34 is performed. The compressed air Ar10d is delivered to the compressed air reservoir 92 via the compressed air delivery unit 34.

The air introduction unit 26 introduces the compressed air Ar10d dehumidified by the dehumidifier 24 into the casing 12c of the motor 12. By introducing the compressed air Ar10d, the pressure inside the casing 12c can be made a positive pressure higher than the outside air pressure to reduce the invasion of dust. The air introduction unit 26 sends the compressed air Ar10d to the introduction port 12h provided at the bottom portion 12e. The air introduction unit 26 is provided with a valve mechanism 26d on a path for guiding the compressed air Ar10d from the dehumidifier 24 to the casing 12c. The valve mechanism 26d may be a check valve that allows the compressed air Ar10d to pass through the casing 12c side when the pressure on the dehumidifier 24 side is equal to or higher than a predetermined pressure and blocks the backflow from the casing 12c to the dehumidifier 24.

The bearing holder 38 will be described with reference to FIGS. 2 and 3. The bearing holder 38 is provided on the input side of the compressor 10 and is a portion that supports the bearings 38h and 38j that pivotally support the rotating shaft 10a. The bearing holder 38 has a hollow cylindrical cylindrical portion 38a and a plurality of fins 38f extending outward in the radial direction from the cylindrical portion 38a. The fin 38f has a triangular shape in which its radial outer end extends radially outward as it approaches the compressor 10 in the axial direction. In this example, four fins 38f are provided on the outer periphery of the cylindrical portion 38a at intervals of 90 ° in the circumferential direction. The bearing holder 38 also has a function of dissipating the heat generated by the compressor 10 to suppress an excessive temperature rise of the bearings 38h and 38j.

The bearings 38h and 38j include a first bearing 38h arranged near the compressor 10 and a second bearing 38j arranged near the motor 12. The first and second bearings 38h and 38j rotatably support the rotating shaft 10a. The first and second bearings 38h and 38j are axially separated and held in the hollow portion of the cylindrical portion 38a.

A part of the bearing holder 38 enters the inner peripheral portion of the multi-blade fan 16 in the axial direction. Further, at least a part of the bearing 38j that supports the rotating shaft 10a of the compressor 10 overlaps with the multi-blade fan 16 in the axial direction. In this case, the axial space can be effectively used as compared with the case where they do not overlap.

The housing case 36 includes a compressor 10, a compressor drive unit 14, a multi-blade fan 16, a cooler 22, a dehumidifier 24, an air introduction unit 26, a blower fan 28, an air suction unit 32, a compressed air delivery unit 34, and an inverter control. Accommodates the cooling unit 42 of the device 40.

The outline of one aspect of the present invention is as follows. The air compressor 100 according to an aspect of the present invention includes a compressor that compresses air sucked from a suction path and sends it out to a delivery path, a motor that drives the compressor, and a supply device that supplies driving power to the motor. And a cooling unit 42 provided in at least a part of the suction path or at least a part of the delivery path to cool the supply device.

According to this aspect, the inside of the cooling unit 42 is forcibly ventilated by the introduced air, the temperature rise of the inverter control device 40 is suppressed, and the life of the electronic component 40p can be extended. Since the inside of the cooling unit 42 is forcibly ventilated, it is not necessary to have a margin in the space inside the box, and the cooling unit 42 can be miniaturized.

The inverter control device 40 may have a heat sink 40h arranged at least a part of the suction path or at least a part of the delivery path. In this case, the heat sink can be efficiently cooled by the introduced air, and the temperature rise of the inverter control device 40 can be further suppressed.

The cooling unit 42 may be provided in the suction path, and a filter for suppressing the passage of dust may be provided upstream of the cooling unit 42. In this case, the dust that infiltrates the cooling unit 42 can be reduced.

A check valve may be provided that allows the flow of air from the cooling unit 42 to the compressor 10 and blocks the flow of air from the compressor 10 to the cooling unit 42. In this case, backflow from the compressor 10 to the cooling unit 42 can be prevented.

The air compressor 100 may be a railroad vehicle air compressor arranged under the floor of the railroad vehicle 90. In this case, compressed air can be supplied to the railway vehicle 90. Further, since the inside of the cooling unit 42 is forcibly ventilated, it is not necessary to have a margin in the space inside the box, and the cooling unit 42 can be miniaturized. Therefore, it can be easily arranged in the underfloor space of the railway vehicle 90, and the underfloor space can be spared.
The above is the description of the first embodiment.

[Second Embodiment]
The air compression device 100 of the second embodiment of the present invention will be described with reference to FIG. FIG. 13 is a system diagram schematically showing the configuration of the air compression device 100 according to the second embodiment, and corresponds to FIG. As shown in this figure, the present embodiment is different from the first embodiment in that the cooling unit 42 introduces air from the delivery path of the compressor 10. That is, compressed air Ar10d is introduced into the cooling unit 42 instead of the suction air Ar32. Therefore, the above description of the cooling unit 42 and the inverter control device 40 can be applied to the present embodiment by replacing the suction air Ar32 with the compressed air Ar10d.

The cooling unit 42 may be provided in any of the delivery paths of the compressed air, but the cooling unit 42 of the present embodiment is provided on the downstream side of the valve mechanism 34d (check valve). Therefore, as shown in FIG. 13, a cooler 22 for cooling the air is provided upstream of the cooling unit 42. In this case, since the air cooled by the cooler 22 can be introduced into the cooling unit 42, the temperature rise in the box can be further suppressed.

Further, as shown in FIG. 13, a dehumidifier 24 for dehumidifying air is provided between the cooling unit 42 and the cooler 22. In this case, since the air dehumidified by the dehumidifier 24 can be introduced into the cooling unit 42, dew condensation inside the box can be prevented.

Further, as shown in FIG. 13, a valve mechanism 34d (check valve) that allows the flow of air from the upstream of the cooling unit 42 to the cooling unit 42 and blocks the flow of air from the cooling unit 42 to the upstream thereof is provided. Provided. In this case, backflow from the cooling unit 42 to the dehumidifier 24 can be prevented.

According to the present embodiment, the same actions and effects as those of the first embodiment are obtained.
The above is the description of the second embodiment.

[Third Embodiment]
The third embodiment of the present invention is an air compression device. The air compressor 100 includes a compressor 10 that compresses the intake air and sends out the compressed air, and air-cools the electronic components using the intake air or the compressed air. The electronic component may be the electronic component 40p of the inverter control device 40, or may be an electronic component that constitutes an electronic circuit different from the inverter control device 40. The method of air-cooling an electronic component may be one in which cooling air is brought into contact with a heat sink attached to the electronic component, or one in which cooling air is brought into direct contact with the electronic component. Good. This cooling may be done in a closed space such as a box, or in a partially or totally open space.

According to the present embodiment, the same actions and effects as those of the first embodiment are obtained.
The above is the description of the third embodiment.

The examples of the embodiments of the present invention have been described in detail above. All of the above-described embodiments are merely specific examples for carrying out the present invention. The content of the embodiment does not limit the technical scope of the present invention, and many design changes such as modification, addition, and deletion of components are made without departing from the idea of the invention defined in the claims. It is possible. In the above-described embodiment, the contents that can be changed in such a design are described with notations such as "in the embodiment" and "in the embodiment", but the contents are designed without such notations. It's not that changes aren't tolerated.

[Modification example]
Hereinafter, a modified example will be described. In the drawings and description of the modified examples, the same or equivalent components and members as those in the embodiment are designated by the same reference numerals. The description overlapping with the embodiment will be omitted as appropriate, and the configuration different from that of the first embodiment will be mainly described.

[First modification]
The air compression device 200 according to the first modification will be described with reference to FIG. This modification is different from the embodiment in that the supercharger 210 is provided at the suction port of the compressor 10, and the other configurations are the same. Therefore, the supercharger 210 will be mainly described. FIG. 14 is a front view showing the periphery of the compressor 10, and corresponds to FIG.

In the scroll type compressor, since the outer peripheral portion has a negative pressure, it is easy to suck dust due to the pressure difference between the outside and the inside. In order to reduce the intrusion of dust, the compressor 10 is provided with a face seal (not shown) that seals the outer peripheral surface. However, the face seal has a gap called a joint, and dust enters through this gap. Therefore, in this modification, the supercharger 210 is provided at the suction port 10c of the compressor 10.

The supercharger 210 is not particularly limited as long as it can increase the internal pressure of the compressor 10. The supercharger 210 of this modification has an impeller 210b that is rotated by a motor 210 m. The supercharger 210 pressurizes the upstream air to bring the downstream air to atmospheric pressure or higher, and supplies the air to the suction port 10c of the compressor 10. The supercharger 210 is provided in the path between the valve mechanism 32d and the suction port 10c. By providing the supercharger 210, the internal pressure in the vicinity of the suction port 10c of the compressor 10, that is, the outer peripheral portion of the compressor 10 can be increased, and the intrusion of dust due to negative pressure can be suppressed.

[Other variants]
In the description of the embodiment, an example is shown in which all the air flowing through the suction path or the delivery path passes through the cooling unit 42, but the present invention is not limited to this. For example, the cooling unit 42 may be configured so that a part of the air flowing through the suction path or the delivery path passes through. That is, a path for bypassing a part of air may be provided in parallel with the cooling unit 42.

In the description of the embodiment, an example is shown in which all the air that has passed through the cooling unit 42 is returned to the original path, but the present invention is not limited to this. A part or all of the air that has passed through the cooling unit 42 may not be returned to the original path, but may be discharged to the outside air, for example.

In the description of the embodiment, an example in which the motor 12 is a surface magnet type DC brushless motor is shown, but the present invention is not limited to this. The motor may be anything as long as it can drive a compressor. For example, the motor may be another type of motor such as a magnet-embedded motor, an AC motor, a brushed motor, or a geared motor.

In the description of the embodiment, an example in which the supply device is the inverter control device 40 has been shown, but the present invention is not limited to this. The supply device may be any device that can supply electric power to the motor. For example, the supply device may be a PLC (Programmable Logic Controller) that supplies electric power to the motor. The PLC may be referred to as a programmable controller or a sequencer.

In the description of the embodiment, an example is shown in which the output shaft 12a of the motor 12 is integrated with the rotation shaft 10a of the compressor 10, but the present invention is not limited to this. For example, the output shaft of the motor may be separated from the rotation shaft of the compressor and connected by a coupling or the like.

In the description of the embodiment, the motor 12 does not include a bearing, and the stator and the rotor are built-in, respectively, but the present invention is not limited to this. For example, the motor may have a bearing, a rotor, and a stator integrated in a motor case.

In the description of the embodiment, an example in which the valve mechanism 26d is a check valve is shown, but the present invention is not limited to this. For example, the valve mechanism 26d may be a secondary pressure regulating valve (pressure reducing valve) capable of adjusting the pressure on the secondary side.

In the description of the embodiment, an example in which the compressor 10 is a scroll type is shown, but the present invention is not limited to this. The compressor may be anything as long as it can generate compressed air, and may be another type of air compressor such as a screw type or a reciprocating type.

The above-mentioned modified example has the same action / effect as that of the first embodiment.

Any combination of the above-described embodiments and modifications is also useful as an embodiment of the present invention. The new embodiments resulting from the combination have the effects of the combined embodiments and variants.

10 ... Compressor, 12 ... Motor, 12c ... Casing, 12n ... Rotating body, 12p ... Static, 12r ... Labyrinth, 14 ... Compressor drive, 15 ... Balance weight, 15b・ ・ Balance adjustment unit, 16 ・ ・ Multi-blade fan, 18 ・ ・ 1st cooler, 20 ・ ・ 2nd cooler, 22 ・ ・ Cooler, 24 ・ ・ Dehumidifier, 26 ・ ・ Air introduction part, 26d ・・ Valve mechanism, 28 ・ ・ Blower fan, 32 ・ ・ Air suction part, 34 ・ ・ Compressed air delivery part, 38 ・ ・ Bearing holder, 40 ・ ・ Inverter control device, 42 ・ ・ Cooling part, 90 ・ ・ Railway vehicle, 100 ... Air compressor.

Claims (7)

A compressor that compresses the air sucked from the suction path and sends it to the delivery path,
The motor that drives the compressor and
A supply device that supplies drive power to the motor,
An air compression device including a cooling unit provided in at least a part of the suction path or at least a part of the delivery path to cool the supply device. The air compression device according to claim 1, wherein the supply device has a heat sink in at least a part of the suction path or at least a part of the delivery path. The cooling unit is provided in the suction path and is provided.
The air compression device according to claim 1 or 2, wherein a filter for suppressing the passage of dust is provided upstream of the cooling unit. The air compression device according to claim 3, further comprising a check valve that allows the flow of air from the cooling unit to the compressor and blocks the flow of air from the compressor to the cooling unit. The cooling unit is provided in the delivery path and is provided.
The air compression device according to claim 1 or 2, wherein a cooler for cooling air is provided upstream of the cooling unit. The air compression device according to claim 5, wherein a dehumidifier for dehumidifying air is provided between the cooling unit and the cooler. The air compressor according to claim 5 or 6, wherein a check valve is provided that allows the flow of air from the upstream of the cooling unit to the cooling unit and blocks the flow of air from the cooling unit to the upstream of the cooling unit.

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