JP6790937B2 - Gas compressor - Google Patents

Description

The present invention relates to a gas compressor provided with a first compression unit and a second compression unit.

Conventionally, an example of a gas compressor provided with a first compression unit and a second compression unit is described in Patent Document 1. The gas compressor described in Patent Document 1 is an air compressor, and the air compressor includes a motor, a compression unit, a low pressure side cylinder, a high pressure side cylinder, a first pipe, a second pipe, and an air tank. The first pipe connects the high pressure side cylinder and the low pressure side cylinder. The second pipe connects the low pressure side cylinder and the first air tank. The first piston is provided in the low pressure side cylinder, and the second piston is provided in the high pressure side cylinder.

When the motor drives the compression unit, the first piston and the second piston operate. When the first piston operates, air is compressed in the low-pressure side cylinder, and the air compressed in the low-pressure side cylinder is sent to the high-pressure side cylinder through the first pipe. The air sent to the high-pressure cylinder is further compressed by the operation of the second piston. The air compressed by the high-pressure cylinder is sent to the air tank through the second pipe.

Japanese Unexamined Patent Publication No. 2015-559505

However, the gas compressor described in Patent Document 1 has a problem of increasing in size because it has a first pipe and a second pipe.

An object of the present invention is to provide a gas compressor capable of suppressing an increase in size.

The gas compressor of one embodiment includes a first compression unit and a second compression unit for compressing a gas, a drive mechanism for driving the first compression unit and the second compression unit, and an accommodating unit for accommodating the drive mechanism. A gas compressor comprising the above, the first air passage for sending the gas discharged from the first compression section to the second compression section, and the gas discharged from the second compression section for sending to an external facility. A case having a second vent, the accommodating portion accommodating the drive mechanism and having an opening, and a lid member fixed to the case and closing the opening. The first vent passage or at least one of the second vent passage is composed of the case and the lid member, and the lid member is along the rotation axis of the drive mechanism with respect to the case. Ru is arranged outside the range overlapping with the first compression unit and the second compression unit in the direction.

In the gas compressor of one embodiment, since the case and the lid member form at least one of the first air passage and the second air passage, it is possible to suppress the increase in size.

It is a top sectional view which shows the air compressor of one Embodiment of this invention. It is a top view of the air compressor. It is a front sectional view of an air compressor. FIG. 5 is a front sectional view taken along line IV-IV of FIG. It is a front view of the crankcase provided in the air compressor. It is a top view which shows the 1st compression part, the 2nd compression part and the crankcase provided in the air compressor. It is a side sectional view in line VII-VII of FIG.

Hereinafter, the air compressor according to the embodiment of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, etc. shown in the drawings are designated by the same reference numerals.

The air compressor 10 shown in FIG. 1 has a first compression unit 11, a second compression unit 12, a drive mechanism 13, a housing unit 14, a control unit 15, a fan 16, two air tanks 17, 18 and a cover 19. .. The air tanks 17 and 18 are made of metal, and the air tanks 17 and 18 are connected by a frame 90 of FIG. 3, respectively. The air tanks 17 and 18 are elements for storing compressed air. The cover 19 is attached to the air tanks 17 and 18, and as shown in FIGS. 2 and 3, the cover 19 covers a part of the outer surface of the air tanks 17 and 18. As shown in FIG. 3, a space A1 covered by the cover 19 is formed between the cover 19 and the air tanks 17 and 18. As shown in FIG. 1, the first compression unit 11, the second compression unit 12, the drive mechanism 13, the accommodating unit 14, the control unit 15, and the fan 16 are arranged in the space A1.

Further, as shown in FIG. 3, a plurality of legs 21 are attached to the air tanks 17 and 18, respectively. The air compressor 10 shown in FIG. 3 represents a state in which a plurality of legs 21 are in contact with a horizontal floor surface. The frame 90 supports the first compression unit 11, the second compression unit 12, and the drive mechanism 13.

The first compression unit 11 and the second compression unit 12 are arranged at intervals from each other. A frame 91 is provided. Grips 22 and 23 are attached to both ends of the frame 91 in the arrangement direction of the first compression unit 11 and the second compression unit 12. The air compressor 10 is portable, and the operator can grasp the grips 22 and 23 with both hands to lift the air compressor 10 and move the air compressor 10 to the work place.

The accommodating portion 14 has a crankcase 25 and a crankcase cover 26 as shown in FIG. The crankcase 25 has an opening 24 as shown in FIG. The crankcase cover 26 is fixed to the crankcase 25 as shown in FIG. 6 and closes the opening 24. Both the crankcase 25 and the crankcase cover 26 are made of metal, for example, aluminum. The crankcase 25 has a tubular shape as shown in FIGS. 4 and 7. As shown in FIG. 3, the crankcase 25 has a leg portion 27, and the leg portion 27 is supported by a frame 90 via an elastic member 28. The elastic member 28 is made of synthetic rubber.

The drive mechanism 13 shown in FIG. 1 includes an electric motor 29 and a rotating shaft 30. The electric motor 29 is arranged outside the crankcase 25, and the electric motor 29 has a stator 31 and a rotor 32. The stator 31 is provided so as not to rotate with respect to the crankcase cover 26. The rotor 32 is connected to the rotating shaft 30. The rotating shaft 30 is arranged concentrically with the rotor 32, and the rotating shaft 30 rotates integrally with the rotor 32. The rotary shaft 30 is arranged from the inside to the outside of the crankcase 25. Bearings 33 are provided on the crankcase 25 and the crankcase cover 26, respectively, and the bearing 33 rotatably supports the rotating shaft 30 about the axis B1.

The fan 16 is attached to the rotating shaft 30. The fan 16 is provided outside the crankcase 25. The cover 19 has an intake port 34 and an exhaust port 35. In the plan view of the air compressor 10 shown in FIG. 1, the fan 16, the electric motor 29, the accommodating unit 14, and the control unit 15 are arranged at different positions in the axis B1 direction. When the air compressor 10 is viewed in a plan view as shown in FIG. 1, the accommodating portion 14 is arranged between the first compression portion 11 and the second compression portion 12 in a direction orthogonal to the axis B1.

As shown in FIGS. 1 and 4, the first compression unit 11 includes a first crank arm 36, a first connecting rod 37, a first piston 38, a first cylinder 39, a first compression chamber 40, an intake chamber 41, and a first. It has an exhaust chamber 42 and a first cylinder head 43. The first crank arm 36 is attached to the rotating shaft 30, and as shown in FIG. 7, the first connecting rod 37 is attached to the first crank arm 36 via a bearing 84. The first piston 38 is attached to the first connecting rod 37. The first piston 38 is provided so as to be reciprocating in the first cylinder 39. The first piston 38 reciprocates in the first cylinder 39 by the rotational force of the rotating shaft 30.

The crankcase 25 has an end face 64, and the first cylinder 39 is in contact with and fixed to the end face of the crankcase 25. The first cylinder 39 forms the first compression chamber 40. The first cylinder head 43 is fixed to the first cylinder 39 and forms an intake chamber 41 and a first exhaust chamber 42. The first compression unit 11 has a first intake valve and a first exhaust valve 44. The first intake valve connects or shuts off the intake chamber 41 and the first compression chamber 40. The first exhaust valve 44 connects or shuts off the first compression chamber 40 and the first exhaust chamber 42.

As shown in FIG. 4, the crankcase 25 is provided with a first air passage 45. As shown in FIG. 1, the intake pipe 46 is provided in the space A1. An intake port is provided on the cover 19, and the first end portion of the intake pipe 46 is connected to the outside of the cover 19 via the intake port. The second end of the intake pipe 46 is connected to the first air passage 45. As shown in FIG. 4, the first cylinder 39 is provided with an intake passage 47 and an exhaust passage 56, and the intake passage 47 is connected to the intake chamber 41 and the first ventilation passage 45. The exhaust passage 56 is connected to the first exhaust chamber 42.

As shown in FIG. 4, the second compression unit 12 includes a second crank arm 48, a second connecting rod 49, a second piston 50, a second cylinder 51, a second compression chamber 52, a second exhaust chamber 53, and a second cylinder. It has a head 54. The second crank arm 48 is attached to the rotating shaft 30, and as shown in FIG. 7, the second connecting rod 49 is attached to the second crank arm 48 via the bearing 85. The second piston 50 is attached to the second connecting rod 49. The second piston 50 is provided so as to be reciprocating in the second cylinder 51. The second piston 50 reciprocates in the second cylinder 51 by the rotational force of the rotating shaft 30. The crankcase 25 has an end face 65. When the accommodating portion 14 is viewed in a plan view as shown in FIG. 6, the end face 65 is parallel to the end face 64 and parallel to the axis B1.

The second cylinder 51 is fixed to the crankcase 25 in contact with the end face 65, and the second cylinder 51 forms the second compression chamber 52. The second cylinder head 54 is fixed to the second cylinder 51 and forms the second exhaust chamber 53.

An intake passage 55 is provided in the second cylinder 51, and the intake passage 55 is connected to the second compression chamber 52. The second compression unit 12 has a second intake valve and a second exhaust valve 57. The second intake valve connects or shuts off the intake passage 55 and the second compression chamber 52. The second exhaust valve 57 connects or shuts off the second compression chamber 52 and the second exhaust chamber 53.

As shown in FIGS. 4, 5 and 6, the crankcase 25 has a connecting passage 63. The connecting passage 63 connects the exhaust passage 56 and the intake passage 55. As shown in FIG. 6, the connection passage 63 includes holes 58, 59, 60, 61 and grooves 62 provided in the crankcase 25 itself. In other words, the crankcase 25 is an element constituting the holes 58, 59, 60, 61 and the groove 62. The hole 58 is opened in the end face 64, and the hole 61 is opened in the end face 65. When the accommodating portion 14 is viewed in a plan view, the holes 58 and 61 are arranged orthogonal to the axis B1, and the holes 59 and 60 are arranged parallel to the axis B1. The hole 58 is connected to the exhaust passage 56 and the hole 59. The hole 61 is connected to the intake passage 55 and the hole 60.

As shown in FIG. 5, the crankcase 25 has an end face 87. When the accommodating portion 14 is viewed in a plane as shown in FIG. 6, the end surface 87 is perpendicular to the axis B1. The groove 62 is provided along the end face 87. A part of the shape of the outer surface 66 of the crankcase 25 is arcuate in a plan view perpendicular to the axis B1. As shown in FIG. 5, the grooves 62 are arranged in an arc shape about the axis B1 in a plan view perpendicular to the axis B1. In this way, the grooves 62 are arranged along the shape of the outer surface 66 of the crankcase 25. The crankcase cover 26 is fixed to the crankcase 25, and the crankcase cover 26 closes the opening 24.

As shown in FIG. 4, the second cylinder 51 has an exhaust passage 67. As shown in FIG. 5, the crankcase 25 has a connecting passage 68. The connection passage 68 has a hole 69, a groove 70 connected to the hole 69, and a hole 71 connected to the groove 70. The hole 69 is connected to the exhaust passage 67 and the groove 70. The groove 70 is provided on the end face 87. The groove 70 is formed in an arc shape along the outer surface 66.

As shown in FIGS. 6 and 7, a seal member 92 is provided between the crankcase cover 26 and the crankcase 25. The crankcase cover 26 is fixed to the crankcase 25 by tightening the screw member 93. The sealing member 92 is a gasket made of synthetic rubber. The shape of the seal member 92 may be either an annular shape or an arc shape. The seal member 92 is in close contact with the crankcase 25 and the crankcase cover 26 around the grooves 62 and 70. The seal member 92 may be fixed to the crankcase 25 or the crankcase cover 26. The sealing member 92 airtightly seals the grooves 62 and 70, respectively.

As described above, the connecting passage 68 is provided in the crankcase 25 itself. In other words, the crankcase 25 is an element that constitutes the connecting passage 68. As shown in FIG. 5, in a plan view perpendicular to the axis B1, the grooves 62 and 70 are arranged on the same circumference centered on the axis B1. The connecting passage 68 is arranged between the rotating shaft 30 and the air tanks 17 and 18.

As shown in FIG. 7, the flexible hose 72 is provided. The first end of the flexible hose 72 is connected to the hole 71 by a coupler 73, and the second end of the flexible hose 72 is connected to the air tank 17 by a coupler 74. As shown in FIG. 1, a connecting pipe 86 for connecting the inside of the air tank 17 and the inside of the air tank 18 is provided, and the air pressures in the two air tanks 17 and 18 are the same.

The air tank 17 is connected to the supply pipe 76 via a pressure reducing valve 75. The pressure reducing valve 75 adjusts the pressure of the air in the air tank 17, specifically, reduces the pressure and sends it to the supply pipe 76. Further, a pressure gauge 77 for displaying the air pressure in the supply pipe 76 is provided. A coupler 78 is provided on the supply pipe 76. The coupler 78 is connected to the working machine via an air hose.

The air tank 18 is connected to the supply pipe 80 via a pressure reducing valve 79. The pressure reducing valve 79 adjusts the pressure of the air in the air tank 18, specifically, reduces the pressure and sends it to the supply pipe 80. Further, a pressure gauge 81 for displaying the air pressure in the supply pipe 80 is provided. A coupler 82 is provided on the supply pipe 80. The coupler 82 is connected to the working machine via an air hose.

As shown in FIG. 2, an operation unit 83 is provided on the surface of the cover 19, and the operation unit 83 has a power switch, a display panel, and an input unit. The control unit 15 includes a substrate, a microcomputer, and an inverter circuit. The microcomputer is provided on a substrate and has an input interface, an output interface, a central arithmetic processing unit, and a storage unit. The inverter circuit has a plurality of switching elements, and the plurality of switching elements can be turned on and off independently. The microcomputer controls the inverter circuit. The inverter circuit connects and disconnects the power supply and the stator 31 of the electric motor 29. The space A1 is provided with a sensor for detecting the phase of the electric motor 29 in the rotation direction and a sensor for detecting the rotation speed of the electric motor 29. Signals from the pressure gauges 77 and 81, the power switch, and various sensors are input to the control unit 15.

Next, an example of using the air compressor 10 will be described. When the operator turns on the power switch, the control unit 15 controls the inverter circuit, and the rotor 32 of the electric motor 29 rotates. When the rotor 32 and the rotating shaft 30 rotate integrally, the first piston 38 and the second piston 50 reciprocate due to the rotational force of the rotating shaft 30. When the first piston 38 operates and the first intake valve opens, the air in the space A1 is sucked into the first compression chamber 40 via the intake pipe 46, the first ventilation passage 45, the intake passage 47 and the intake chamber 41. .. Air is compressed in the first compression chamber 40 by the operation of the first piston 38. When the pressure in the first compression chamber 40 rises and the first exhaust valve 44 opens, the air in the first compression chamber 40 is discharged to the first exhaust chamber 42. The air discharged to the first exhaust chamber 42 is sent to the second compression unit 12 via the exhaust passage 56, the connection passage 63, and the intake passage 55.

In the second compression unit 12, when the second piston 50 operates and the second intake valve opens, the air in the intake passage 55 is sucked into the second compression chamber 52. When the air is further compressed in the second compression chamber 52 by the operation of the second piston 50 and the second exhaust valve 57 is opened, the air in the second compression chamber 52 is discharged to the second exhaust chamber 53. The air discharged to the second exhaust chamber 53 is sent to the air tanks 17 and 18 via the exhaust passage 67, the connection passage 68, and the flexible hose 72.

As described above, the air compressor 10 is a multi-stage compressor in which the first compression unit 11 and the second compression unit 12 increase the air pressure in two stages. The air compressor 10 is a reciprocating type that converts the rotational force of the rotating shaft 30 into the reciprocating power of the first piston 38 and the second piston 50. The air compressor 10 is provided with connection passages 63 and 68 in the accommodating portion 14 itself. That is, the accommodating portion 14 has a role of accommodating the rotating shaft 30, the first connecting rod 37, and the second connecting rod 49, and also serves as an element constituting the connecting passages 63 and 68. Therefore, it is not necessary to separately provide a pipe for sending compressed air from the first compression unit 11 to the second compression unit 12 and a pipe for sending compressed air from the second compression unit 12 to the air tank 17.

Therefore, it is possible to suppress the increase in size of the air compressor 10 and the increase in the weight of the air compressor 10. Further, since it is not necessary to provide piping, an increase in the number of parts of the air compressor 10 can be suppressed, and a space for arranging parts can be omitted. Further, it is possible to suppress an increase in the manufacturing cost of the air compressor 10. Furthermore, it is possible to suppress the generation of noise due to the vibration of the piping.

Further, the crankcase 25 and the crankcase cover 26 are made of metal and have excellent thermal conductivity. Then, when the compressed air passes through the connecting passages 63 and 68, the heat of the compressed air is transferred to the crankcase 25 and the crankcase cover 26. Therefore, the temperature rise of the compressed air can be suppressed. Further, the heat transferred from the compressed air passing through the connecting passages 63 and 68 to the crankcase 25 and the crankcase cover 26 is transferred to the air flowing through the space A1 to raise the temperature of the crankcase 25 and the crankcase cover 26. Can be suppressed. Therefore, a flexible hose 72 having low heat resistance can be used.

Further, the hole 71, which is a part of the connecting passage 68, is arranged at the position closest to the air tank 17 in the crankcase 25. Therefore, the total length of the flexible hose 72 connecting the hole 71 and the air tank 17 can be shortened as much as possible.

Further, when the rotating shaft 30 rotates and the fan 16 rotates, the air outside the cover 19 is introduced into the space A1 through the intake port 34, and the air introduced into the space A1 is introduced from the exhaust port 35 to the cover 19. It is discharged to the outside. Therefore, the temperature rise in the space A1 can be suppressed. In particular, the heat of the electric motor 29, the accommodating unit 14, and the control unit 15 is transferred to the air flowing through the space A1, and the temperature rise of the electric motor 29, the accommodating unit 14, and the control unit 15 can be suppressed.

Explaining the meaning of the matters described in the embodiment, the air compressor 10 is an example of a gas compressor, the air tank 17 is an example of external equipment, and air is an example of gas. The connecting passage 63 is an example of the first ventilation passage, and the connecting passage 68 is an example of the second ventilation passage. The crankcase 25 is an example of a case, and the crankcase cover 26 is an example of a lid member. The fan 16 is an example of a cooling fan, and the electric motor 29 is an example of a motor.

The gas compressor is not limited to the above embodiment, and can be variously modified without departing from the gist thereof. For example, one of the connection passages 63 and 68 may be provided in the accommodating portion 14 itself, and the other one may be provided outside the accommodating portion 14 as a pipe. The gas to be compressed includes air and an inert gas. Further, the number of air tanks for storing the gas compressed by the second compression unit may be one or a plurality. Further, the gas compressed by the second compression unit may be sent to the working machine via an air hose or a pipe without passing through an air tank. In this case, the working machine corresponds to external equipment.

The accommodating portion of the present disclosure includes a space for accommodating a drive mechanism, and the accommodating portion includes a casing and a housing. The first vent and the second vent of the present disclosure may pass gas, and the first vent and the second vent include holes, grooves, and notches. The first air passage and the second air passage include those provided on the lid member. The first vent and the second vent include those provided on at least one of the case or the lid member. The accommodating portion includes one accommodating a part of the drive mechanism and one accommodating the whole drive mechanism.

10 ... air compressor, 11 ... first compression unit, 12 ... second compression unit, 13 ... drive mechanism, 14 ... accommodation unit, 16 ... fan, 17, 18 ... air tank (external equipment), 19 ... cover, 24 ... opening, 25 ... crankcase (case), 26 ... crankcase cover (lid member), 29 ... electric motor (motor), 30 ... rotating shaft, 38 ... first piston, 39 ... first cylinder, 40 ... 1 compression chamber, 50 ... second piston, 51 ... second cylinder, 52 ... second compression chamber, 63 ... connection passage (first ventilation passage), 68 ... connection passage (second ventilation passage), 66 ... outer surface, 92 … Seal member.

Claims (8)

A gas compressor including a first compression unit and a second compression unit for compressing a gas, a drive mechanism for driving the first compression unit and the second compression unit, and an accommodation unit for accommodating the drive mechanism. hand,
A first air passage that sends the gas discharged from the first compression unit to the second compression unit, and
A second ventilation path that sends the gas discharged from the second compression unit to an external facility, and
Have,
The accommodating part
A case that accommodates the drive mechanism and has an opening,
A lid member fixed to the case and closing the opening,
Have,
At least one of the first air passage or the second air passage is composed of the case and the lid member .
The lid member, relative to said casing, said in a direction along the rotational axis of the drive mechanism Ru is located outside the range overlapping with the first compression unit and the second compression unit, the gas compressor. The gas compressor according to claim 1, wherein the external equipment includes a tank for storing gas discharged from the second compression unit. The accommodating portion has a sealing member between the case and the lid member.
The gas compressor according to claim 1 or 2, wherein the sealing member airtightly seals at least one of the first air passage and the second air passage. The drive mechanism has a motor and
The rotating shaft is connected to the motor and housed in the case .
The first compression unit is
The first piston that reciprocates with the rotational force of the rotating shaft and
A first cylinder that reciprocally supports the first piston,
A first compression chamber that compresses gas by the reciprocating motion of the first piston, and
Have,
The second compression unit is
A second piston that reciprocates with the rotational force of the rotating shaft,
A second cylinder that reciprocally supports the second piston,
A second compression chamber that compresses gas by the reciprocating motion of the second piston, and
Have,
The gas compressor according to claim 3, wherein the first air passage connects the first compression chamber and the second compression chamber. The gas compressor according to any one of claims 1 to 4, wherein at least one of the first vent passage and the second vent passage includes a groove formed in the accommodating portion. The accommodating portion has a tubular shape.
The gas compressor according to any one of claims 1 to 5, wherein at least one of the first vent passage and the second vent passage is arranged along the outer surface of the accommodating portion. A cover that covers the first compression portion, the second compression portion, and the accommodating portion.
A fan provided in the space covered by the cover and introducing a gas outside the cover into the space covered by the cover.
Is provided,
The fan is provided on the rotating shaft.
The gas compressor according to any one of claims 1 to 6, wherein the lid member is arranged on the side where the fan is provided in the case . A gas compressor including a first compression unit and a second compression unit for compressing a gas, a drive mechanism for driving the first compression unit and the second compression unit, and an accommodation unit for accommodating the drive mechanism. hand,
A first air passage that sends the gas discharged from the first compression unit to the second compression unit, and
A second ventilation path that sends the gas discharged from the second compression unit to an external facility, and
Have,
The accommodating part
A case that accommodates the drive mechanism and has an opening,
A lid member fixed to the case and closing the opening,
Have,
At least one of the first air passage or the second air passage is composed of the case and the lid member.
The drive mechanism
With the motor
A rotating shaft connected to the motor and housed in the case,
Have,
The first compression unit is
The first piston that reciprocates with the rotational force of the rotating shaft and
A first cylinder that reciprocally supports the first piston,
A first compression chamber that compresses gas by the reciprocating motion of the first piston, and
Have,
The second compression unit is
A second piston that reciprocates with the rotational force of the rotating shaft,
A second cylinder that reciprocally supports the second piston,
A second compression chamber that compresses gas by the reciprocating motion of the second piston, and
Have,
The first air passage connects the first compression chamber and the second compression chamber, and connects the first compression chamber and the second compression chamber.
A gas compressor in which the first vent and the second vent are arranged in an arc shape on the same circumference centered on the rotation axis .

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