JP6954182B2 - Gas compressor - Google Patents

Description

The present invention relates to a gas compressor including a rotating member and an operating member that operates by the rotational force of the rotating member to compress a gas.

Patent Document 1 describes an example of a gas compressor including a rotating member and an operating member that operates by the rotational force of the rotating member to compress a gas. The gas compressor described in Patent Document 1 is an air compressor, and the air compressor has an electric motor, a case, a first compression unit, and a second compression unit. The first compression unit includes a first cylinder, a first piston as an operating member, a first connecting rod, and a first compression chamber. The second compression unit includes a second cylinder, a second piston as an operating member, a second connecting rod, and a second compression chamber.

The first piston is provided in the first cylinder and the second piston is provided in the second cylinder. The electric motor has a rotating member, and the rotating member is arranged in the case. The first connecting rod and the second connecting rod are connected to the rotating member. The first connecting rod is rotatably connected to the first piston and the second connecting rod is rotatably connected to the second piston. A first compression chamber is formed in the first cylinder, and a second compression chamber is formed in the second cylinder. An air supply pipe connecting the first compression chamber and the second compression chamber is provided.

In the air compressor described in Patent Document 1, when the rotating member of the electric motor rotates, the first piston reciprocates in the first cylinder, and the second piston reciprocates in the second cylinder. Therefore, air is sucked into the first compression chamber, and the air is compressed in the first compression chamber. The air discharged from the first compression chamber is sent to the second compression chamber through the air supply pipe. The second compression chamber further compresses the air.

Japanese Unexamined Patent Publication No. 2016-21180

Since the gas compressor described in Patent Document 1 compresses the gas in two stages of a first compression unit and a second compression unit, it compresses a compressed gas having a higher pressure than a gas compressor that compresses the gas in one stage. Obtainable. The inventor of the present application has recognized the problem that a gas compressor that compresses a gas in two stages is larger in size as a whole than a gas compressor that compresses a gas in one stage.

An object of the present invention is gas compression capable of obtaining a compressed gas having a higher pressure than a gas compressor that compresses a gas in one step and being smaller than a gas compressor that compresses a gas in two steps. To provide an opportunity.

The gas compressor of one embodiment is a gas compressor including a rotating member and a compression unit that operates by the rotational force of the rotating member to compress a gas, and the compression unit is the rotating member of the rotating member. An actuating member that operates by rotational force, a case that operably accommodates the actuating member, a first compression chamber and a second compression chamber provided in the case and separated by the actuating member, and the first compression chamber. A ventilation path connecting the 1 compression chamber and the 2nd compression chamber , allowing gas to flow into the 1st compression chamber from the outside of the case, and from the 1st compression chamber to the outside of the case. A first check valve that prevents the outflow of gas and a gas that allows the inflow of gas from the first compression chamber to the second compression chamber and the gas from the second compression chamber to the first compression chamber. It has a second check valve that blocks inflow, the rotating member is arranged inside the first compression chamber, and the first compression chamber is airtightly sealed to a support portion of the rotating member. has a seal member, wherein the first compression chamber, said actuating member is ejected by suction and compress the gas to be activated, the second compression chamber, when the operation member is operated from the first compression chamber The discharged gas is sucked and compressed and discharged.

Since the gas compressor of one embodiment compresses the gas in the first compression chamber and the second compression chamber in two stages, it is possible to obtain a compressed gas having a higher pressure than the gas compressor that compresses the gas in one stage. In addition, it can be made smaller than a gas compressor that compresses gas in two stages.

It is a front view which shows the appearance of Embodiment 1 of a typical air compressor among several embodiments included in the gas compressor of this invention. It is a right side view which shows the appearance of the air compressor of FIG. It is a top view which cut out a part of the air compressor of FIG. It is a front view which shows a part of the structure of the air compressor of FIG. It is a front view which shows the arrangement example of the tank provided in the air compressor of FIG. It is a partial plan sectional view of the air compressor of FIG. It is a compression part provided in the air compressor of FIG. 1, and is the vertical cross-sectional view of the state where the piston is located at the top dead center. It is a compression part provided in the air compressor of FIG. 1, and is a vertical cross-sectional view of a state in which a piston is operating from a top dead center to a bottom dead center. It is a compression part provided in the air compressor of FIG. 1, and is the vertical cross-sectional view of the state where the piston is located at the bottom dead center. It is a compression part provided in the air compressor of FIG. 1, and is a vertical cross-sectional view of a state in which a piston is operating from a bottom dead center to a top dead center. It is a vertical sectional view which shows Embodiment 2 of an air compressor. It is a partial vertical sectional view of FIG. 8A. It is a vertical sectional view which shows Embodiment 3 of an air compressor. It is a vertical sectional view which shows Embodiment 4 of an air compressor. FIG. 10A is a partial vertical sectional view of FIG. 10A. It is a graph which shows an example of the pressure change of the 1st compression chamber of an air compressor, and an example of the pressure change of the 2nd compression chamber.

Hereinafter, a typical air compressor embodiment among several embodiments included in the gas compressor of the present invention will be described with reference to the drawings.

(Embodiment 1)
Embodiment 1 of the air compressor is shown in FIGS. 1, 2, 3, 3, 4, 5, and 6. The same or equivalent components, members, etc. shown in the drawings are designated by the same reference numerals.

The air compressor 10 includes a frame member 11, an electric motor 12, a compression unit 13, and a tank 14. The frame member 11 is formed of a metal or a synthetic resin alone, or is formed of a combination of a metal and a synthetic resin. The frame member 11 has two end portions 15, 16 and a connecting portion 17. The connecting portion 17 connects the end portion 15 and the end portion 16. As shown in FIGS. 1 and 4, the shapes of the outer peripheral portions 113 of the end portions 15 and 16 are both substantially triangular when viewed from the front of the air compressor 10. That is, the outer peripheral portion 113 has three long sides 113A, 113B, 113C. Three connecting portions 17 are provided, and the portions corresponding to the vertices of the end portions 15 and 16 of the substantially triangular shape are connected to each other. The end portions 15 and 16 are parallel to each other, and the connecting portions 17 are parallel to each other. The meaning of the front view of the air compressor 10 will be described later.

The frame member 11 supports the unit 51 via the elastic member 50. The elastic member 50 is, for example, synthetic rubber. The unit 51 includes a support member 77, a motor housing 21, a crankcase 28, a speed reducer cover 29, a compression unit 13, and a tank 14. The support member 77 is an element that supports the motor housing 21, the crankcase 28, the speed reducer cover 29, the compression unit 13, and the tank 14. The support member 77 is, for example, made of metal or synthetic resin. The support member 77 may have either a plate shape or a frame shape.

As shown in FIG. 1, a cover 18 is provided inside the end portion 15. The cover 18 is made of metal or synthetic resin as an example. A plurality of intake ports 19 that penetrate the cover 18 in the thickness direction are provided. A cover 20 is provided between the end portions 15 and 16. The cover 20 is made of metal or synthetic resin as an example. A touch panel 49 is provided on the cover 20. The touch panel 49 has an operation unit and a display unit that can be operated by an operator.

The display unit notifies the operator of the state of the air compressor and the operation content in the operation unit. The display unit includes a liquid crystal display as an example. When the operator operates the operation unit, it is possible to switch the power on / off, switch the mode, switch the display content on the display unit, and the like. The display unit displays the air pressure in the tank 14, the pressure of the compressed air sent from the tank 14 to the outside, the operation mode, the voltage applied to the electric motor, the time, the ambient temperature of the air compressor, and the like.

In the front view of the air compressor 10 shown in FIGS. 4 and 5, the electric motor 12, the compression unit 13, and the tank 14 are arranged inside the outer peripheral portions 113 of the end portions 15 and 16. The frame member 11 supports the motor housing 21. As shown in FIG. 6, the electric motor 12 is arranged, that is, housed in the inner 48 of the motor housing 21. The motor housing 21 has a tubular shape. The motor housing 21 is made of metal or synthetic resin as an example. The motor housing 21 has a ventilation path (not shown), and the inside 48 of the motor housing 21 is connected to the outside E1 of the motor housing 21 via the ventilation path.

The electric motor 12 has a stator 22 and a rotor 23. The stator 22 is provided so as not to rotate in the motor housing 21. The stator 22 has a coil 24 through which an electric current flows. The electric motor 12 is a brushless motor. The substrate 25 is provided inside 48 of the motor housing 21, and the coil 24 is connected to the substrate 25. The board 25 is connected to the power supply via the electric wire 26 and the inverter circuit.

The rotor 23 is fixed to the drive shaft 27. As shown in FIGS. 3 and 6, the crankcase 28 is fixed to the motor housing 21, and the reduction gear cover 29 is fixed to the crankcase 28. The crankcase 28 is made of metal as an example, and the speed reducer cover 29 is made of metal as an example. A part of the crankcase 28 is arranged between the motor housing 21 and the speed reducer cover 29. The crankcase 28 supports the bearing 30 and the motor housing 21 supports the bearing 31. The bearings 30 and 31 rotatably support the drive shaft 27 about the center line A1.

The rotor 23 and the stator 22 are arranged between the bearing 30 and the bearing 31 in the center line A1 direction. In the center line A1 direction, at least a part of the arrangement range of the rotor 23 and at least a part of the arrangement range of the stator 22 overlap. The fan 32 is attached to the drive shaft 27. The fan 32 is arranged between the bearing 30 and the electric motor 12 in the center line A1 direction.

A part of the drive shaft 27 in the center line A1 direction is arranged inside the crankcase 28. A pulley 33 is attached to a portion of the drive shaft 27 that is arranged inside the crankcase 28. The rotating shaft 34 is provided over the inside of the crankcase 28 and the inside 47 of the speed reducer cover 29. The crankcase 28 supports the bearing 35, and the bearing 35 rotatably supports the rotating shaft 34 about the center line A2. A first pulley 36 and a second pulley 37 are attached to the rotating shaft 34. The outer diameter of the first pulley 36 is larger than the outer diameter of the pulley 33, and the annular belt 38 is wound around the pulley 33 and the first pulley 36. The pulley 33, the first pulley 36, and the belt 38 form the first deceleration unit 39.

The crankshaft 40 is provided over the inside of the crankcase 28 and the inside 47 of the speed reducer cover 29. The crankcase 28 supports the bearings 41 and 42, and the bearings 42 and 42 rotatably support the crankshaft 40 about the center line A3. The balancer 58 is attached to the crankshaft 40, and the crank pin 59 is attached to the balancer 58. The crank pin 59 is arranged at a position eccentric from the center line A3. A first compression chamber 46 is formed inside the crankcase 28. At least a part of the crankshaft 40, the connecting rod 60, and the crank pin 59 are arranged in the first compression chamber 46. The first compression chamber 46 is connected to the inside of the cylinder 55. The bearing 42 has a sealing member. The sealing member airtightly seals the first compression chamber 46.

As shown in FIGS. 6 and 7, a partition wall 52 is provided between the motor housing 21 and the crankcase 28. The partition wall 52 is an element that separates the first compression chamber 46 from the inside 48, and the partition wall 52 has a ventilation hole 53. The motor housing 21 has a ventilation path 110. The interior 48 is connected to the first compression chamber 46 via a ventilation passage 110 and a ventilation hole 53. A reed valve 54 is provided in the first compression chamber 46. The reed valve 54 allows the air inside 48 to flow into the first compression chamber 46 via the ventilation passage 110 and the ventilation hole 53, and the air in the first compression chamber 46 allows the air in the first compression chamber 46 to flow through the ventilation passage 53 and the ventilation hole 53. It is a check valve that prevents flow to the inside 48 via the air passage 110.

In the plan view of the air compressor 10, the center line A1, the center line A2, and the center line A3 are arranged in parallel. In a plan view of the air compressor 10, the center line A3 is arranged between the center line A1 and the center line A2. As shown in FIG. 4, with the air compressor 10 placed on the horizontal floor B1, the three center lines A1, A2, and A3 are located at substantially the same height in the vertical direction.

The pulley 43 is attached to the crankshaft 40. The outer diameter of the pulley 43 is larger than the outer diameter of the second pulley 37. An annular belt 44 is wound around the second pulley 37 and the pulley 43. The second pulley 37, the pulley 43, and the belt 44 form the second speed reduction section 45. Viewing the air compressor 10 in a plane perpendicular to the center lines A1, A2, and A3 is a front view of the air compressor 10 in the present disclosure. Looking at the air compressor 10 from above with the air compressor 10 placed on the floor B1 as shown in FIG. 4 is a plan view of the air compressor 10 in the present disclosure. Then, when the air compressor 10 is viewed from the front as shown in FIG. 4, the second deceleration unit 45 is arranged in the space inside the belt 38. Further, when the air compressor 10 is viewed in a plan view as shown in FIG. 6, the belt 38 is arranged between the belt 44 and the fan 32 in the center line A3 direction.

The compression unit 13 has a cylinder 55, a cylinder head 56, a piston 57, and a crankcase 28. As an example, the cylinder 55 is made of metal and has a cylindrical shape. The cylinder 55 is fixed to the crankcase 28. The balancer 58 is attached to the crankshaft 40, and the crank pin 59 is attached to the balancer 58. The crank pin 59 is arranged at a position eccentric from the center line A3. A connecting rod 60 is provided, and the connecting rod 60 connects the crankpin 59 and the piston 57. The piston 57 has a cylindrical shape and can reciprocate in the cylinder 55 in the center line C1 direction. The center line C1 is the center of the cylinder 55.

A valve seat 71 is provided between the cylinder 55 and the cylinder head 56. The valve seat 71 is made of metal as an example. A second compression chamber 61 is formed between the piston 57 and the valve seat 71 in the cylinder 55. The piston 57 airtightly separates the first compression chamber 46 of the crankcase 28 from the second compression chamber 61.

A relay chamber 62 and an exhaust chamber 63 are provided between the cylinder head 56 and the valve seat 71. The valve seat 71 is a partition wall that separates the second compression chamber 61 from the relay chamber 62 and the exhaust chamber 63. The cylinder 55 has a first air passage 64, and the valve seat 71 has a second air passage 65, a third air passage 66, and a fourth air passage 67. The first compression chamber 46 of the crankcase 28 is connected to the relay chamber 62 via the first ventilation passage 64 and the second ventilation passage 65. The relay chamber 62 is connected to the second compression chamber 61 via the third ventilation passage 66.

A reed valve 68 is provided in the second compression chamber 61. The reed valve 68 allows the air in the relay chamber 62 to flow into the second compression chamber 61 via the third ventilation passage 66, and the air in the second compression chamber 61 passes through the third ventilation passage 66. It is a check valve that prevents the air from flowing to the relay chamber 62 via the relay chamber 62.

The second compression chamber 61 is connected to the exhaust chamber 63 via the fourth ventilation passage 67. A reed valve 69 is provided in the exhaust chamber 63. The reed valve 69 allows the air in the second compression chamber 61 to flow to the exhaust chamber 63 via the fourth ventilation passage 67, and the air in the exhaust chamber 63 passes through the fourth ventilation passage 67. This is a check valve that prevents the air from flowing into the second compression chamber 61.

A ventilation pipe 70 is provided. The ventilation pipe 70 connects the exhaust chamber 63 and the inside of the tank 14. A flexible hose is used as an example of the ventilation pipe 70. The curved shape of the flexible hose can be changed arbitrarily. As shown in FIGS. 3 and 5, a relief valve 72 is provided in the tank 14. When the air pressure in the tank 14 is less than a predetermined value, the relief valve 72 is closed. When the air pressure in the tank 14 becomes equal to or higher than a predetermined value, the relief valve 72 opens and the compressed air in the tank 14 is discharged to the outside of the tank 14.

The tank 14 is connected to the supply pipe 74 via a pressure reducing valve 73. A regulator handle 76 is provided on the pressure reducing valve 73. The operator operates the regulator handle 76 to adjust the degree of pressure reduction of the pressure reducing valve 73. The pressure reducing valve 73 adjusts the pressure of the air discharged from the tank 14 to the supply pipe 74, specifically, reduces the pressure. The air socket 75 is attached to the supply pipe 74. The air socket 75 can be attached to and detached from the air hose. The air socket 75 is connected to the working machine via an air hose.

The control unit 78 is provided on the support member 77. The control unit 78 is a microcomputer provided with an input interface, an output interface, a storage device, and an arithmetic processing device on a control board. The control unit 78 is connected to a power source via a power cable. The touch panel 49 is connected to the control unit 78 via an electric wire and a signal line. The air compressor 10 has a sensor for detecting the pressure in the tank 14, a sensor for detecting the air pressure adjusted by the pressure reducing valve 73, a sensor for detecting the air temperature, and a sensor for detecting the voltage of the power supply. The signals output from these sensors are input to the control unit 78.

The operator operates the touch panel 49 to turn on the power switch and select the operation mode. The air pressure in the tank 14 is set according to the operation mode. The current of the power source is supplied to the electric motor 12, and the drive shaft 27 of the electric motor 12 rotates. The rotational force of the drive shaft 27 is transmitted to the crankshaft 40 via the first deceleration section 39 and the second deceleration section 45. When the rotational force of the drive shaft 27 is transmitted to the rotary shaft 34, the first deceleration unit 39 amplifies the rotational force by making the rotational speed of the rotary shaft 34 lower than the rotational speed of the drive shaft 27. When the rotational force of the rotating shaft 34 is transmitted to the crankshaft 40, the second deceleration unit 45 amplifies the rotational force by making the rotational speed of the crankshaft 40 lower than the rotational speed of the rotary shaft 34.

When the crankshaft 40 rotates, the piston 57 reciprocates in the cylinder 55. The operation of the compression unit 13 will be described with reference to FIGS. 7A, 7B, 7C and 7D. For convenience, an example in which the crankshaft 40 rotates counterclockwise from the position where the piston 57 is at the top dead center shown in FIG. 7A will be described. The top dead center of the piston 57 is the position where the piston 57 is closest to the valve seat 71 in the center line C1 direction.

The piston 57 operates from the top dead center shown in FIG. 7A toward the bottom dead center as shown in FIG. 7B. When the piston 57 operates in a direction away from the valve seat 71, air is compressed in the first compression chamber 46, and the reed valve 54 closes the introduction path 53. Further, the air compressed in the first compression chamber 46 enters the relay chamber 62 via the first ventilation passage 64 and the second ventilation passage 65, and the air pressure in the relay chamber 62 rises. Due to the operation of the piston 57, the pressure in the second compression chamber 61 is reduced. Therefore, the reed valve 68 opens the third ventilation passage 66, and the air in the relay chamber 62 is sucked into the second compression chamber 61 via the third ventilation passage 66.

Then, as the crankshaft 40 rotates, the piston 57 reaches the bottom dead center as shown in FIG. 7C. The bottom dead center of the piston 57 is the position where the piston 57 is in the center line C1 direction and is the farthest from the valve seat 71.

Further, when the piston 57 operates from the bottom dead center to the top dead center shown in FIG. 7C, the pressure in the first compression chamber 46 decreases. Therefore, as shown in FIG. 7D, the reed valve 54 opens the introduction path 53, and the air inside the motor housing 21 enters the first compression chamber 46 via the ventilation hole 110 and the introduction path 53. Further, when the piston 57 operates from the bottom dead center to the top dead center, the air is compressed again in the second compression chamber 61. Therefore, the reed valve 68 closes the third air passage 66. Further, the reed valve 69 opens the fourth ventilation passage 67, and the air in the second compression chamber 61 is discharged to the exhaust chamber 63 via the fourth ventilation passage 67. The air in the exhaust chamber 63 is stored in the tank 14 via the ventilation pipe 70.

Then, as the crankshaft 40 rotates, the piston 57 reaches the top dead center shown in FIG. 7A. In this way, the rotational force of the drive shaft 27 is rotated by the crankshaft 40, and the piston 57 reciprocates in the cylinder 55. The compression unit 13 compresses the gas in two stages, and the air discharged from the compression unit 13 is stored in the tank 14. When the air pressure in the tank 14 reaches the target pressure set by the touch panel 49 or the pressure corresponding to the target pressure, the control unit 78 stops the electric motor 12.

In this way, the compression unit 13 of the air compressor 10 performs the first stage air compression in the first compression chamber 46 of the crankcase 28, and performs the second stage air compression in the second compression chamber 61. Therefore, it is possible to generate high-pressure compressed air as compared with an air compressor that compresses air in one step. Further, the piston 57 and the connecting rod 60 have both a function as an element for performing air compression in the first stage and a function as an element for performing air compression in the second stage. Therefore, in the air compressor 10 of the present disclosure, the element that performs the first stage air compression and the element that performs the second stage air compression are separately separated from the air compressor that compresses the air in two stages. There is no need to provide it. For example, working parts such as pistons and connecting rods can be reduced. In particular, it is possible to suppress an increase in the number of parts for the element that performs the first stage air compression, and it is possible to suppress an increase in the manufacturing cost of the air compressor 10. In addition, the crankcase has been downsized, and the elements that perform the first stage air compression and the elements that perform the second stage air have been shared, so that the weight of the air compressor 10 can be reduced and the physique can be reduced. Can be miniaturized.

Further, when the fan 32 rotates together with the drive shaft 27, the air of the outside E1 of the motor housing 21 is sucked into the inside 48 of the motor housing 21. A part of the air sucked into the inside 48 of the motor housing 21 enters the first compression chamber 46 of the crankcase 28 via the introduction path 53. Further, a part of the air sucked into the inside 48 of the motor housing 21 cools the substrate 25 and the electric motor 12, and is discharged to the outside E1 of the motor housing 21.

Further, since the center lines A1 and A3 are arranged in parallel with each other, the air compressor 10 can be miniaturized in the height direction of the floor B1. Further, the control unit 78 has a control board, and is arranged so that the direction along the surface of the control board and at least one of the center line A1 and the center line A3 are parallel to each other. Therefore, the air compressor 10 can be miniaturized in the height direction of the floor B1.

In the radial direction of the fan 32, a ventilation hole 53 is provided on the outside of the fan 32. The amount of air flowing into the first compression chamber 46 can be increased by positively sending the air flowing by the rotation of the fan 32 into the ventilation holes 53. Therefore, the fan 32 and the vent 53 act like a kind of turbocharger.

The ventilation hole 53 is provided at a location covered by the motor housing 21 and the crankcase 28. Therefore, it is possible to reduce the sound of the air inside 48 being discharged from the ventilation hole 53 into the first compression chamber 46 leaking to the outside of the motor housing 21 and the crankcase 28. Therefore, the noise of the compressor 10 can be reduced.

(Embodiment 2)
The second embodiment of the air compressor 10 will be described with reference to FIGS. 8A and 8B. In the configuration of the second embodiment of the air compressor 10, the ones common to the configuration of the first embodiment of the air compressor 10 are designated by the same reference numerals as those of the first embodiment of the air compressor 10.

In the air compressor 10 shown in FIG. 8A, the drive shaft 27 and the crankshaft 40 are arranged concentrically with the center line A4 as the center. The drive shaft 27 and the crankshaft 40 are connected so as to rotate integrally. The crankcase 28 has a first boss portion 80 and a second boss portion 81. The first boss portion 80 and the second boss portion 81 are fixed to each other.

A cylinder portion 96 protruding from the outer surface of the second boss portion 81 is provided, and the cylinder 55 is fixed to the cylinder portion 96. Further, a part of the tubular portion 96 has a notch portion, and the rubber bush 111 seals the notch portion. The notch is provided for inserting the connecting rod 60 into the crankcase 28. The rubber bush 111 is inserted into the notch and airtightly seals the first compression chamber 84. Further, fins 97 that protrude in the radial direction from the outer surface of the cylinder 55 and are provided along the center line C1 direction are provided.

The first boss portion 80 has a tubular shape, and a wall portion 82 protruding inward from the inner surface of the first boss portion 80 is provided. The second boss portion 81 has a tubular shape, and a wall portion 83 protruding inward from the inner surface of the second boss portion 81 is provided. The first compression chamber 84 is formed between the wall portion 82 and the wall portion 83 and in the tubular portion 96. The first compression chamber 84 is connected to the inside of the cylinder 55.

A tubular portion 85 connected to the wall portion 82 is provided, and the tubular portion 85 supports the bearing 86. A tubular portion 87 connected to the wall portion 83 is provided, and the tubular portion 87 supports the bearing 88. Bearings 86 and 88 rotatably support the crankshaft 40. The bearing 86 has an inner ring 86A, an outer ring 86B, and a seal member 86D. The bearing 88 has an inner ring 88A, an outer ring 88B, and a seal member 88D. The sealing members 86D and 88D airtightly shut off the first compression chamber 84 and the external E1. Further, the movement of the bearing 88 is restricted by the bearing retainer 88C, and the movement of the bearing 86 is restricted by the bearing retainer 86C.

The crankcase 28 has a ventilation path 91. The ventilation path 91 connects the external E1 of the crankcase 28 and the first compression chamber 84. A reed valve 90 is provided in the first compression chamber 84. The reed valve 90 allows the air outside the crankcase 28 to flow to the first compression chamber 84 via the ventilation passage 91, and the air in the first compression chamber 84 passes through the ventilation passage 91. This is a check valve that prevents the air from flowing to the outside E1 of the crankcase 28.

A part of the crankshaft 40 is arranged outside the crankcase 28. A flywheel 89 is provided on the external E1 of the crankcase 28. The flywheel 89 is made of metal as an example and is fixed to the crankshaft 40.

A fan 32 is attached to the drive shaft 27. The electric motor 12 is arranged on the outside E1 of the crankcase 28, and the electric motor 12 is arranged between the fan 32 and the crankcase 28 in the center line A4 direction. Further, the wall portions 82 and 83 are arranged between the electric motor 12 and the flywheel 89 in the center line A4 direction. The flywheel 89 may be arranged between the electric motor 12 and the wall portions 82 and 83.

As shown in FIG. 8B, the first end portion of the connecting rod 60 is connected to the crankshaft 40 in the first compression chamber 84. The connecting rod 60 is arranged between the wall portion 82 and the wall portion 83 in the center line A4 direction. A disk-shaped boss portion 92 is provided at the second end of the connecting rod 60. A disk-shaped retainer 93 is attached to the boss portion 92. The retainer 93 is attached to the boss portion 92 by tightening the screw member 94. The piston 57 is formed by the boss portion 92 and the retainer 93.

The piston 57 can reciprocate in the cylinder 55 in the center line C1 direction. The center line C1 and the center line A4 are at right angles. An annular sealing member 95 is attached between the boss portion 92 and the retainer 93. As an example, the seal member 95 can use a lip packing made of synthetic resin. The seal member 95 may be made of synthetic rubber. The seal member 95 comes into contact with the inner peripheral surface of the cylinder 55. A second compression chamber 61 is formed between the piston 57 and the valve seat 71. The piston 57 and the seal member 95 airtightly separate the first compression chamber 84 and the second compression chamber 61. The first compression chamber 84 is connected to the relay chamber 62 and the second compression chamber 61 by the same configuration as in the first embodiment of the air compressor 10.

In the second embodiment of the air compressor 10, when the rotational force of the drive shaft 27 of the electric motor 12 is transmitted to the crankshaft 40, the piston 57 reciprocates in the center line C1 direction. When the piston 57 operates from the top dead center to the bottom dead center, the reed valve 90 closes the air passage 91, and the air is compressed in the first compression chamber 84. When the piston 57 operates from the bottom dead center to the top dead center, the reed valve 90 opens the ventilation passage 91, and air is sucked from the ventilation passage 91 into the first compression chamber 84. Further, as in FIG. 7D, the air is compressed in the second compression chamber 61, and the compressed air is discharged to the exhaust chamber 63.

Also in the second embodiment of the air compressor 10, an element for performing the first stage air compression and an element for performing the second stage air compression are separately provided for the air compressor that compresses the air in two stages. There is no need. For example, working parts such as pistons and connecting rods can be reduced. In particular, it is possible to suppress an increase in the number of parts for the element that performs the first stage air compression, and it is possible to suppress an increase in the manufacturing cost of the air compressor 10. In addition, the crankcase has been downsized, and the elements that perform the first stage air compression and the elements that perform the second stage air have been shared, so that the weight of the air compressor 10 can be reduced and the physique can be reduced. Can be miniaturized.

Further, in the second embodiment of the air compressor 10, the distance L1 between the inner surface 82A of the wall portion 82 and the inner surface 83A of the wall portion 83 is smaller than the outer diameter D1 of the piston 57. Therefore, the volume of the first compression chamber 84 with respect to the effective area of the piston 57 can be reduced as much as possible. In other words, it is possible to increase the compression ratio when performing the first stage air compression in the first compression chamber 84 as much as possible.

Further, the flywheel 89 is provided on the external E1 of the crankcase 28. Therefore, the distance L1 can be further reduced. Further, in the center line A4 direction, at least a part of the bearings 86 and 88 is arranged at a position separated from the inner surface 82A of the wall portion 82 and the inner surface 83A of the wall portion 83. Therefore, the distance L1 can be further reduced.

(Embodiment 3)
The third embodiment of the air compressor 10 is shown in FIG. In the configuration of the third embodiment of the air compressor 10, the ones common to the configurations of the first and second embodiments of the air compressor 10 are designated by the same reference numerals as those of the first and second embodiments of the air compressor 10. There is.

In the air compressor 10 shown in FIG. 9, the drive shaft 27 and the crankshaft 40 are arranged concentrically with the center line A4 as the center. The drive shaft 27 and the crankshaft 40 rotate integrally. The crankcase 28 has a first boss portion 80 and a second boss portion 81. The first boss portion 80 and the second boss portion 81 are fixed to each other.

The first boss portion 80 has a disk shape, and a tubular portion 85 is provided at the inner peripheral end of the first boss portion 80. The tubular portion 85 supports the bearing 86. The second boss portion 81 has openings 98 and 99. Further, the second boss portion 81 has a wall portion 83 and a tubular portion 87, and the tubular portion 87 supports the bearing 88. The opening 98 is connected to the inside of the cylinder 55. A first compression chamber 84 is formed between the first boss portion 80 and the second boss portion 81, and over the opening 98.

A cover 100 that closes the opening 99 is provided. The cover 100 is made of metal as an example, and the cover 100 has a ventilation path 101. The ventilation path 101 connects the first compression chamber 84 and the external E1 of the crankcase 28. A reed valve 102 is provided in the first compression chamber 84. The reed valve 102 allows the air of the external E1 to flow to the first compression chamber 84 via the ventilation passage 101, and the air of the first compression chamber 84 passes through the ventilation passage 101 to the external E1. It is a check valve that prevents the air from flowing into the air.

Further, the spacer 107 is provided in the first compression chamber 84. The spacer 107 is arranged in the first compression chamber 84 at a position that does not hinder the operation of the operating element and the piston 57 that are arranged in the first compression chamber 84, or in a state that does not hinder the operation. The operating elements are a crankshaft 40, a drive shaft 27, inner rings 86A and 88A, and a connecting rod 60.

The spacer 107 is made of a material having a lower density than the material constituting the crankcase 28. If the crankcase 28 is made of aluminum as an example, the spacer 107 can use a synthetic resin as an example. The spacer 107 is an element for occupying a part of the space of the first compression chamber 84 and narrowing the substantial volume of the first compression chamber 84. The shape of the spacer 107 may be any of a block shape, a plate shape, a wire shape, and the like.

In the third embodiment of the air compressor 10, when the rotational force of the drive shaft 27 of the electric motor 12 is transmitted to the crankshaft 40, the piston 57 reciprocates in the center line C1 direction. When the piston 57 operates from the top dead center to the bottom dead center, the reed valve 102 closes the air passage 101, and the air is compressed in the first compression chamber 84. When the piston 57 operates from the bottom dead center to the top dead center, the reed valve 102 opens the ventilation passage 101, and the air of the external E1 is sucked into the first compression chamber 84 via the ventilation passage 101. Further, the air is further compressed in the second compression chamber 61 shown in FIG. 7D, and the air is discharged to the exhaust chamber 63.

Also in the third embodiment of the air compressor 10, an element for performing the first stage air compression and an element for performing the second stage air compression are separately provided for the air compressor that compresses the air in two stages. There is no need. For example, working parts such as pistons and connecting rods can be reduced. In particular, it is possible to suppress an increase in the number of parts for the element that performs the first stage air compression, and it is possible to suppress an increase in the manufacturing cost of the air compressor 10. In addition, the crankcase has been downsized, and the elements that perform the first stage air compression and the elements that perform the second stage air have been shared, so that the weight of the air compressor 10 can be reduced and the physique can be reduced. Can be miniaturized.

Further, in the third embodiment of the air compressor 10, the spacer 107 is arranged in the first compression chamber 84, so that the substantial volume of the first compression chamber 84 is narrowed. Therefore, the volume of the first compression chamber 84 with respect to the effective area of the piston 57 can be reduced as much as possible. Therefore, it is possible to increase the compression ratio as much as possible when performing the first stage air compression in the first compression chamber 84.

(Embodiment 4)
Embodiment 4 of the air compressor 10 will be described with reference to FIGS. 10A and 10B. In the configuration of the fourth embodiment of the air compressor 10, what is common to the configurations of the first, second and third embodiments of the air compressor 10 is the first, second and second embodiments of the air compressor 10. The same reference numerals as those in Form 3 are attached.

The compression unit 13 is arranged above the motor housing 21 in the vertical direction. The crankcase 28 is located above the motor housing 21, and the cylinder 55 is located above the crankcase 28. When the air compressor 10 is viewed in a plan view, the arrangement area of the cylinder 55, the arrangement area of the crankcase 28, and the arrangement area of the motor housing 21 overlap at least in a part.

The tank 14 and the motor housing 21 are integrated. A partition wall 104 is provided that separates the inside 48 of the motor housing 21 and the inside 14A of the tank 14. When the air compressor 10 is viewed in a plan view, the tank 14 and the motor housing 21 are aligned in the center line A1 direction. A pressure gauge 105 is attached to the supply pipe 74. The pressure gauge 105 displays the pressure in the supply pipe 74.

A pulley 33 is attached to the drive shaft 27, and a pulley 43 is attached to the crankshaft 40. The annular belt 103 is wound around the pulleys 33 and 43. The center line A1 of the drive shaft 27 and the center line A3 of the crankshaft 40 are arranged in parallel. The rotational force of the drive shaft 27 is transmitted to the crankshaft 40 via the belt 103. The pulley 33, the belt 103, and the pulley 43 form the reduction gear 106.

The flywheel 89 is attached to the crankshaft 40 and is arranged in the first compression chamber 84. The flywheel 89 is arranged between the connecting rod 60 and the bearing 88 in the center line A3 direction.

In the fourth embodiment of the air compressor 10, what is common to the configurations of the first, second and third embodiments of the air compressor 10 is the first, second and third embodiments of the air compressor 10. You can get the same effect as. Further, when the air compressor 10 is viewed in a plan view, the arrangement area of the cylinder 55, the arrangement area of the crankcase 28, and the arrangement area of the motor housing 21 overlap at least in a part. Therefore, the air compressor 10 can be miniaturized in the plane direction of the floor B1.

FIG. 11 shows an example of the pressure change in the first compression chamber and an example of the pressure change in the second compression chamber. When the piston operates between top dead center and bottom dead center, in the embodiment of the air compressor, the pressure in the first compression chamber changes as shown by the solid line, and the pressure in the second compression chamber changes as shown by the solid line. do. In the comparative example of the air compressor, the pressure inside the crankcase is substantially constant as shown by the broken line. The pressure shown by the solid line changes to high or low with respect to the pressure shown by the broken line. A comparative example of an air compressor has a structure in which the inside of the crankcase is not used as the first compression chamber.

The meanings of the matters disclosed in the embodiment of the air compressor will be described. The air compressor 10 is an example of a gas compressor. The compression unit 13 is an example of a compression unit. The crankshaft 40 is an example of a rotating member. The first compression chambers 46 and 84 are examples of the first compression chambers. The second compression chamber 61 is an example of the second compression chamber. The piston 57 is an example of an operating member. The crankcase 28 and the cylinder 55 are examples of cases. The first air passage 64, the second air passage 65, the third air passage 66, and the relay chamber 62 are examples of air passages. The piston 57 is an example of a piston.

The distance L1 is an example of the dimensions of the first compression chamber, and the outer diameter D1 is an example of the dimensions in the radial direction of the piston. The flywheel 89 is an example of an inertial body. The external E1 is an example of the outside of the case. Bearings 86 and 88 are examples of bearings. The inner surfaces 82A and 83A are examples of the inner surfaces of the case. The spacer 107 is an example of a space-occupied object. The frame member 11 is an example of a support element. The center line A3 is an example of the center line of the rotating member. The electric motor 12 is an example of a drive source. The center line A1 is an example of the center line of the drive source. The motor housing 21 is an example of a housing. The tank 14 is an example of a tank. The reed valve 68 is an example of a check valve. The introduction path 53 is an example of an introduction path.

The gas compressor is not limited to the embodiment disclosed with reference to the drawings, and can be variously modified without departing from the gist thereof. For example, the drive source may be an electric motor, a hydraulic motor, a pneumatic motor, or an engine. Further, the air compressor may be either one provided with a deceleration portion or one without a deceleration portion in the power transmission path between the motor and the crankshaft.

Further, a configuration for reducing the volume of the first compression chamber can also be obtained by designing the thickness or shape of the connecting rod. When changing the thickness of the connecting rod, it is possible to suppress an increase in the mass of the connecting rod by making the connecting rod hollow. Further, the structure for narrowing the volume of the first compression chamber can be obtained by enlarging the flywheel provided in the first compression chamber.

The gas compressed by the gas compressor includes air and an inert gas. The inert gas includes nitrogen gas and noble gas. The rare gas includes argon gas and helium gas.

Further, the rotating member includes a power transmission element such as a rotating shaft, a gear, a pulley and a belt. The case includes a housing having an internal space and a housing having an internal space. Vents and inlets include holes, openings, ports, grooves and slits. Bearings include radial bearings and thrust bearings. A space monopoly is a morphological object or solid. The support element has the strength to support the compression portion, and the support element includes a frame member, a skeleton member, and a housing.

Integral housing and tank includes a structure in which at least a portion of the housing and at least a portion of the tank are made up of a single member. Integral housing and tank includes a structure in which the housing and tank are separately configured and fixed to each other.

10 Air compressor 11 Frame member 12 Electric motor 13 Compressor 14 Tank 21 Motor housing 28 Crankcase 40 Crankshaft 46, 84 First compression chamber 55 Cylinder 57 Piston 61 Second compression chamber 62 Relay chamber 64 First ventilation path 65 2 Ventilation path 66 Third ventilation path 82A, 83A Inner surface 86,88 Bearing 89 Flywheel 107 Spacer A1, A3 Center line D1 Outer diameter E1 Outer L1 Distance

Claims (10)

A gas compressor including a drive source, a rotating member that rotates by the rotational force of the drive source, and a compression unit that operates by the rotational force of the rotating member to compress gas.
The compression unit is
An operating member that operates by the rotational force of the rotating member and compresses the gas, and
A case for operably accommodating the operating member and
A first compression chamber and a second compression chamber provided in the case and separated by the operating member,
A ventilation path connecting the first compression chamber and the second compression chamber,
A first check valve that enables the inflow of gas from the outside of the case to the first compression chamber and prevents the outflow of gas from the first compression chamber to the outside of the case.
A second check valve that enables the inflow of gas from the first compression chamber to the second compression chamber and blocks the inflow of gas from the second compression chamber to the first compression chamber.
Have,
The rotating member is arranged inside the first compression chamber, and the support portion of the rotating member has a sealing member that airtightly seals the first compression chamber.
When the operating member operates, the first compression chamber sucks and compresses the gas and discharges the gas.
The second compression chamber is a gas compressor that sucks and compresses and discharges the gas discharged from the first compression chamber when the operating member operates. The operating member has a cylindrical piston.
The gas compressor according to claim 1, wherein in the radial direction of the piston, the minimum dimension of the distance between the wall surfaces sandwiching the operating member in the first compression chamber is smaller than the maximum dimension of the piston. An inertial body is attached to the rotating member,
The rotating member is arranged outside the case and over the first compression chamber.
The gas compressor according to claim 1 or 2, wherein the inertial body is attached to a portion of the rotating member arranged outside the case. A bearing is provided between the case and the rotating member and rotatably supports the rotating member.
The inner surface of the case is arranged so as to surround the first compression chamber.
The gas compressor according to claim 2, wherein at least a part of the bearing is arranged outside the inner surface of the case in the radial direction of the piston. The gas compressor according to any one of claims 1 to 4, further comprising an embedded member provided in the first compression chamber and which does not hinder the operation of the operating member. A motor housing accommodating the drive source and
An introduction path connecting the inside of the motor housing and the first compression chamber,
Is provided,
The drive source is cooled by the gas flowing inside the motor housing and is cooled.
The gas compressor according to any one of claims 1 to 5, wherein a part of the gas flowing inside the motor housing flows into the first compression chamber via the introduction path. The gas compressor according to any one of claims 1 to 6, wherein the center line when the rotating member rotates and the center line when the drive source rotates are arranged in parallel. A control unit capable of controlling the drive source is further provided.
The control unit is arranged so that its longitudinal direction is parallel to at least one of a center line when the rotating member rotates and a center line when the drive source rotates. The gas compressor according to any one of 1 to 7. A housing that houses the drive source and
A tank for storing the gas discharged from the second compression chamber and
Is provided,
The gas compressor according to claim 7 or 8, wherein the housing and the tank are integrated. A support element for supporting the drive source and the compression unit is provided.
The outer peripheral portion of the support element is a substantially triangular shape having three long sides in a plan view perpendicular to the center line when the rotating member rotates.
The gas compressor according to any one of claims 1 to 9, wherein the drive source and the compression unit are arranged inside the outer peripheral portion in a plan view perpendicular to the center line.

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