JP2019108811A - Gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas compressor capable of suppressing the water contained in a gas compressed by a first compression unit from being sent to a second compression unit. SOLUTION: A first compression unit 14 for compressing a gas, a second compression unit for further compressing a gas sent from the first compression unit 14, and an air supply connecting the first compression unit 14 and the second compression unit. A gas compressor including the unit 102, wherein the first compression unit 14 reciprocates in the first cylinder 36, the first compression chamber 41 formed in the first cylinder 36, and the first cylinder 36. When the moving first piston 40, the seal ring 83 attached to the outer peripheral surface of the first piston 40, and the first piston 40 are connected and the rotational force of the rotating element is converted into the reciprocating power of the first piston 40. It has a first connecting rod 39 that swings with respect to the first cylinder 36 together with the first piston 40, and the air supply unit 102 has a water removing device 62 that captures the water of the gas and the pressure of the gas. It has a pressure lowering device 62 for lowering. [Selection diagram] Fig. 3

Description

  The present invention relates to a gas compressor provided with a first compression unit for compressing a gas and a second compression unit for further compressing the gas sent from the first compression unit.

  Patent Document 1 describes an example of a gas compressor provided with a first compression unit for compressing a gas and a second compression unit for further compressing the gas sent from the first compression unit. The gas compressor described in Patent Document 1 is an air compressor, and the air compressor has a motor, a crankcase, a first compression unit, and a second compression unit. The first compression portion has a first cylinder, a first piston, a first connecting rod, and a first compression chamber. The second compression portion has a second cylinder, a second piston, a second connecting rod, and a second compression chamber. The first cylinder and the second cylinder are attached to the crankcase.

  A first piston is provided in the first cylinder and a second piston is provided in the second cylinder. The motor has a motor shaft, which is arranged in the crankcase. A first connecting rod and a second connecting rod are connected to the motor shaft. The first connecting rod is pivotally connected to the first piston and the second connecting rod is pivotally 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 motor shaft rotates, the first piston reciprocates in the first cylinder, and the second piston reciprocates in the second cylinder. For this reason, air is drawn into the first compression chamber, and the air is compressed in the first compression chamber. Air compressed in the first compression chamber is sent to the second compression chamber through the air supply pipe. The air sent to the second compression chamber is further compressed.

JP, 2017-8777, A

  The inventors of the present invention have a possibility that air compressed in the first compression unit may remain between the first compression unit and the second compression unit when the gas compressor is driven and then the gas compressor is stopped. I recognized that there was. A portion of the compressed air remaining between the first compression portion and the second compression portion is discharged from the gap between the piston and the cylinder. However, if the piston and connecting rod of the first compression section are so-called rocking pistons that are configured to rock with respect to the cylinder, compressed air is unlikely to be discharged from the gap between the piston and the cylinder. For this reason, the inventor of the present application recognized that compressed air may remain in the first compression section.

  Further, the inventor of the present application has found that the temperature of the air compressed in the first compression section is rising, and when the compressed air remains over the first compression section and the second compression section, the compressed air is naturally cooled and the air is It was recognized that the water contained in could become water droplets. The same is true for the compressed air remaining in the cylinder of the second compression section.

  Furthermore, the inventor of the present application has found that, if the gas compressor is activated again after the gas compressor is stopped, the compressed air remaining over the first compression unit and the second compression unit, or in the cylinder of the second compression unit. It has been recognized that the residual compressed air serves as a resistance during cylinder operation and may cause a start failure of the gas compressor.

  The inventor has recognized that air containing moisture may be sent to the second compression unit, and compressed air may remain from the first compression unit to the second compression unit.

  An object of the present invention is to provide a gas compressor capable of suppressing that moisture contained in a gas compressed in a first compression section is sent to a second compression section.

  Another object of the present invention is to provide a gas compressor capable of reducing the pressure of the gas remaining in the first compression section and the second compression section.

  A gas compressor according to one embodiment includes a first compression unit for compressing a gas, a second compression unit for further compressing the gas sent from the first compression unit, the first compression unit, and the second compression unit. And an air supply unit for connecting the gas compressed by the first compression unit to the second compression unit, and the first compression unit is configured to A cylinder, a first compression chamber formed in the first cylinder, a first piston for compressing the gas in the first compression chamber by reciprocating in the first cylinder, and the first piston An annular seal ring attached to an outer peripheral surface of the first piston, the first piston connected to the first piston and the rotary element, and converting the rotational force of the rotary element into reciprocating power of the first piston First connector that swings with respect to the first cylinder A water removal device for capturing the moisture of the gas sent from the first compression unit to the second compression unit; and a second compression unit from the first compression unit. And a pressure reducing device for reducing the pressure of the gas remaining over the portion.

  The gas compressor of one embodiment can suppress moisture contained in the gas compressed in the first compression unit from being sent to the second compression unit, and extends from the first compression unit to the second compression unit. It is possible to reduce the pressure of the remaining gas.

It is a top view showing a representative air compressor among some embodiments contained in a gas compressor of the present invention. It is a side view showing the whole air compressor. It is a plane sectional view showing the 1st compression part of an air compressor. It is a plane sectional view showing the 2nd compression part of an air compressor. It is a partial top view which shows an example of the connection structure of a 1st compression part and a 2nd compression part. It is a partial plane sectional view showing an example of arrangement of a control part. It is a partial top view which shows the other example of the connection structure of a 1st compression part and a 2nd compression part. It is a partial side view of the air compressor which provided the drainage pipe inside the cover.

  Hereinafter, among several embodiments included in the gas compressor of the present invention, representative embodiments of the air compressor will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, etc. which are shown by each drawing.

  The air compressor 10 shown in FIGS. 1 and 2 has a metal frame 11, a cover 12, an electric motor 13, a first compression unit 14 and a second compression unit 15, a control unit 16, and air tanks 17 and 18. . The air tanks 17 and 18 are made of metal, and the air tanks 17 and 18 are attached to the frame 11, and a plurality of legs 19 are attached to the air tanks 17 and 18, respectively. The air compressor 10 of FIG. 2 represents a state in which the plurality of legs 19 are in contact with a horizontal floor surface. The frame 11 supports the electric motor 13, the first compression unit 14, and the second compression unit 15. The cover 12 is attached to the air tanks 17 and 18 and the frame 11.

  A bracket 20 is provided on the air tanks 17 and 18 and the frame 11, and the screw member 21 is tightened to fix the cover 12. The cover 12 is made of synthetic resin or metal. The electric motor 13, the first compression unit 14, and the second compression unit 15 are disposed in an interior B <b> 1 that is a space covered by the cover 12.

  The first compression unit 14 and the second compression unit 15 are arranged at an interval in a predetermined direction. Grips 22 and 23 are attached to both ends of the frame 11 in the arrangement direction of the first compression portion 14 and the second compression portion 15. The air compressor 10 is portable, and the operator can hold the grips 22 and 23 with both hands to lift the air compressor 10 and move it to the work place.

  The crankcase 24 is fixed to the frame 11. The crankcase 24 is made of metal, and the rotary shaft 25 is disposed from the inside to the outside of the crankcase 24. The crankcase 24 rotatably supports the rotating shaft 25 via a bearing. The rotating shaft 25 is rotatable about an axis A1. A crank portion is provided at a position of the rotation shaft 25 disposed inside the crankcase 24.

  The electric motor 13 has a stator 26 and a rotor 27. The stator 26 is provided so as not to rotate relative to the crankcase 24. The rotor 27 is attached to the rotating shaft 25. An example in which the electric motor 13 is a three-phase alternating current brushless motor will be described. A plurality of permanent magnets are attached to the rotor 27 along the rotational direction. In addition, the stator 26 has coils corresponding to three phases, specifically, the U phase, the V phase, and the W phase.

  A cooling fan 28 is attached to the rotating shaft 25. The cooling fan 28 is provided in the inside B1 of the cover 12. The cover 12 has a first wall 29, a second wall 30, an upper wall 33 and side walls 31 and 32. The first wall portion 29, the second wall portion 30, and the side walls 31, 32 extend downward in FIG. 2 from the outer peripheral edge of the upper wall 33. The first wall 29 and the second wall 30 are spaced in the direction of the axis A1.

  The side walls 31, 32 connect the first wall portion 29 and the second wall portion 30, and are arranged at intervals in a direction intersecting the axis A1. An intake port 34 is provided through the first wall 29, and an exhaust port 35 is provided through the second wall 30. The intake port 34 connects the inside B1 and the outside B2 of the cover 12, and the exhaust port 35 connects the inside B1 and the outside B2 of the cover 12. The intake port 34 is a passage that guides the air of the outside B2 of the cover 12 to the inside B1. The exhaust port 35 is a passage that guides the air flowing through the inside B1 of the cover 12 to the outside B2.

  In a plan view of the air compressor 10 shown in FIG. 1, the cooling fan 28, the electric motor 13, the crankcase 24 and the control unit 16 are disposed between the first wall 29 and the second wall 30 in the direction of the axis A1. It is arranged at a different position. As the first wall 29 approaches the second wall 30 in the direction of the axis A1, the cooling fan 28, the electric motor 13, the crankcase 24 and the controller 16 are arranged in this order. That is, among the cooling fan 28, the electric motor 13, the crankcase 24, and the control unit 16, the cooling fan 28 is disposed at a position closest to the first wall portion 29 in the direction of the axis A1.

  Of the cooling fan 28, the electric motor 13, the crankcase 24 and the control unit 16, the control unit 16 is disposed at a position closest to the second wall 30 in the direction of the axis A 1. The electric motor 13 and the crankcase 24 are disposed between the cooling fan 28 and the control unit 16 in the direction of the axis A1. The electric motor 13 is disposed between the cooling fan 28 and the crankcase 24 in the direction of the axis A1. The crankcase 24 is disposed between the electric motor 13 and the control unit 16 in the direction of the axis A1.

  In a plan view of the air compressor 10, at least a part of the arrangement area of the cooling fan 28 and the electric motor 13 in the direction of the axis A1 overlaps the arrangement area of the air tank 17 in the direction of the axis A1. In a plan view of the air compressor 10, at least a part of the arrangement area of the control unit 16 in the direction of the axis A1 overlaps the arrangement area of the air tank 18 in the direction of the axis A1.

  When the air compressor 10 is viewed in plan, the first compression section 14 is disposed between the crankcase 24 and the side wall 31 in a direction intersecting the axis A1. As shown in FIG. 3, the first compression section 14 has a first cylinder 36, a first cylinder head 37, a first partition 38, a first connecting rod 39, a first piston 40, a first compression chamber 41, and a first exhaust chamber. 42, a first check valve 43 and a port 44 are provided.

  The first cylinder head 37 is fixed to the first cylinder 36. The first partition wall 38 is provided between the first cylinder head 37 and the first cylinder 36. The port 44 penetrates the first partition wall 38 and connects the first compression chamber 41 and the first exhaust chamber 42.

  The first end of the first connecting rod 39 is rotatably connected to the crank portion of the rotating shaft 25 inside the crankcase 24. A disc-shaped boss 110 is provided at the second end of the first connecting rod 39. A disc-shaped retainer 111 is attached to the boss portion 110. The retainer 111 is attached to the boss 110 by tightening the screw member 112. A first piston 40 is formed by the boss portion 110 and the retainer 111. An annular seal member 83 is attached between the boss 110 and the retainer 111. The seal member 83 can use lip packing made of synthetic rubber as an example. The seal member 83 contacts the inner circumferential surface of the first cylinder 36. The first piston 40 is capable of reciprocating within the first cylinder 36.

  The first compression chamber 41 is formed on the outer peripheral surface of the first piston 40 between the first piston 40 and the first partition 38 in the first cylinder 36. The first exhaust chamber 42 is formed between the first partition wall 38 and the first cylinder head 37. The first check valve 43 is provided in the first partition 38, and the first check valve 43 opens and closes the port 44. The first check valve 43 allows air in the first compression chamber 41 to be discharged to the first exhaust chamber 42, and prevents air in the first exhaust chamber 42 from flowing to the first compression chamber 41. Do.

  As shown in FIG. 4, the second compression portion is configured of the second cylinder 45, the second cylinder head 46, the second partition wall 47, the second connecting rod 48, the second piston 49, the second compression chamber 50, and the second exhaust chamber 51. , Port 52 and a second check valve 53.

  The second cylinder head 46 is fixed to the second cylinder 45. The second partition wall 47 is provided between the second cylinder head 46 and the second cylinder 45. The second piston 49 is provided reciprocably in the second cylinder 45. The first end of the second connecting rod 48 is connected to the crank of the rotary shaft 25 in the crankcase 24. The second end of the second connecting rod 48 is connected to the second piston 49. The second compression chamber 50 is formed in the second cylinder 45 between the second piston 49 and the second partition wall 47. The port 52 is formed through the second partition wall 47 and connects the second compression chamber 50 and the second exhaust chamber 51.

  A piston ring 54 is attached to the outer peripheral surface of the second piston 49. The piston ring 54 is made of fluorocarbon resin, and has a notch 55 at one circumferential position. The second exhaust chamber 51 is formed between the second partition wall 47 and the second cylinder head 46. The second check valve 53 is provided in the second partition wall 47, and the second check valve 53 opens and closes the port 52. The second check valve 53 allows the air of the second compression chamber 50 to be discharged to the second exhaust chamber 51, and prevents the air of the second exhaust chamber 51 from flowing to the second compression chamber 50. Do.

  As shown in FIG. 1, the filter support 56 is provided on the cover 12. The filter support portion 56 is provided with a part of the cover 12 depressed toward the inside B1. The filter 57 is supported by the filter support 56. The filter 57 is made of a material such as felt, non-woven fabric, sponge or the like. The filter support portion 56 has an intake port 58, and the intake port 58 is connected to the first compression chamber 41 via an intake pipe 59.

  The first connection pipe 60 is connected to the first exhaust chamber 42. The first connection pipe 60 is made of metal as an example. The second connection pipe 61 is connected to the second compression chamber 50. The second connection pipe 61 is made of metal as an example. A water removing device 62 connecting the first connection pipe 60 and the second connection pipe 61 is provided. The water removing device 62 has a metal pipe 63 and a filter 64 provided in the pipe 63. The first end of the pipe 63 is connected to the first connection pipe 60 via a joint 65. The second end of the pipe 63 is connected to the second connection pipe 61 via a joint 66. The filter 64 allows air to pass and captures moisture and dust. A hollow fiber membrane is used as the filter 64 as an example.

  Furthermore, a drain port 67 penetrating the pipe 63 in the radial direction is provided. The first end of the pipe 63 is supported by a clamp 68, and the second end of the pipe 63 is supported by a clamp 69. The clamps 68 and 69 are both fixed to the crankcase 24 by screw members 70.

  When the air compressor 10 is viewed in plan as shown in FIG. 1, the water removing device 62 has an axial shape and is disposed to intersect with the axis A1. Further, when the air compressor 10 is viewed in plan as shown in FIG. 1, at least a part of the arrangement area of the water removing device 62 is included in the arrangement area of the crankcase 24. When the air compressor 10 is viewed in plan as shown in FIG. 1, the water removing device 62 is disposed between the cooling fan 28 and the control unit 16 in the direction of the axis A1. When the air compressor 10 is viewed from the side as shown in FIG. 2, the water removing device 62 is disposed between the upper wall 33 and the crankcase 24 in the vertical direction. The control unit 16 is disposed at a position lower than the water removing device 62 in the vertical direction in FIG. 2 and at a position higher than the air tanks 17 and 18. The vertical direction in FIG. 2 is the action direction of gravity. The first connection pipe 60, the second connection pipe 61, and the water removing device 62 constitute an air supply unit 102.

  As shown in FIG. 2, ribs 71 are provided on the upper wall 33. The rib 71 protrudes from the inner surface of the upper wall 33 toward the crankcase 24. The rib 71 may be formed integrally with the cover 12 or may be formed as a separate member from the cover 12. When the air compressor 10 is viewed in plan as shown in FIG. 1, the rib 71 is disposed to intersect with the axis A1 and the water removing device 62. When the air compressor 10 is viewed in plan as shown in FIG. 1, at least a part of the range in which the rib 71 is disposed overlaps the region in which the crankcase 24 is disposed. The drainage port 67 is disposed between the rib 71 and the first compression portion 14 when the air compressor 10 is viewed in plan.

  A connection pipe 72 connecting the second exhaust chamber 51 and the air tank 18 is provided. A connection pipe 73 connecting the air tank 17 and the air tank 18 is provided. The air pressure in the two air tanks 17, 18 is the same. As shown in FIG. 1, a pressure sensor 74 is provided which detects the pressure in the air tanks 17 and 18 and outputs a signal.

  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 discharges it to the supply pipe 76. In addition, a pressure gauge 77 for displaying the air pressure in the supply pipe 76 is provided. Coupler 78 is attached to supply tube 76. The coupler 78 is attachable to and detachable from the air hose. 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 discharges it to the supply pipe 80. Further, a pressure gauge 81 for displaying the air pressure in the supply pipe 80 is provided. Coupler 82 is attached to supply tube 80. The coupler 82 is attachable to and detachable from the air hose. The coupler 82 is connected to the working machine via an air hose.

  An operation unit is provided on the surface of the cover 12, and the operation unit includes a power switch, a display panel, and the like. The control unit 16 is a mechanism that controls the operation and stop of the first compression unit 14 and the second compression unit 15. The control unit 16 is a microcomputer having an input interface, an output interface, a central processing unit, and a storage unit.

  An inverter circuit is provided in the inside B1 of the cover 12. The inverter circuit connects and disconnects the power supply and the stator 26 of the electric motor 13. The inverter circuit has a plurality of switching elements, and the plurality of switching elements can be independently turned on and off. The control unit 16 controls an inverter circuit. A sensor for detecting the phase of the electric motor 13 in the rotational direction and a sensor for detecting the rotational speed of the electric motor 13 are provided in the inside B1 of the cover 12. Signals of the pressure sensor 74, the power switch, and various sensors are input to the control unit 16. The control unit 16 may include an inverter circuit.

  As shown in FIG. 2, a drain pipe 99 is provided, and the drain pipe 99 is connected to the inside of the air tanks 17 and 18 via a valve 100. When the operator opens the valve 100, the compressed air in the air tanks 17, 18 is discharged from the drain pipe 99 to the outside of the air tanks 17, 18.

  Next, an example in which the operator uses the air compressor 10 will be described. When the worker turns on the power switch, the control unit 16 controls the inverter circuit, and the rotor 27 of the electric motor 13 rotates. When the rotor 27 and the rotary shaft 25 rotate integrally, the first piston 40 and the second piston 49 reciprocate by the torque of the rotary shaft 25.

  When the first connecting rod 39 is actuated by the torque of the rotating shaft 25, the first connecting rod 39 and the first piston 40 swing relative to the first cylinder 36, and the first piston 40 is in the first cylinder 36. Reciprocate. Here, the term “rocking” means that the first connecting rod 39 and the first piston 40 operate in a pendulum shape with the contact point between the inner surface of the first cylinder 36 and the seal member 83 as a fulcrum. Thus, the rotational force of the rotary shaft 25 of the electric motor 13 is converted to the reciprocating power of the first piston 40. That is, the rotational force of the rotating shaft 25 of the electric motor 13 is converted into the operating force of the first compression unit 14. The second connecting rod 48 converts the rotational force of the rotary shaft 25 of the electric motor 13 into the reciprocating power of the second piston 49. That is, the rotational force of the rotating shaft 25 of the electric motor 13 is converted into the operating force of the second compression unit 15.

  The air in the interior B1 of the cover 12 is drawn into the first compression chamber 41 of the first compression section 14 via the intake port 58 and the intake pipe 59, and the air is compressed in the first compression chamber 41. The air compressed in the first compression chamber 41 passes through the first exhaust chamber 42 and is sent to the first connection pipe 60. The air sent to the first connection pipe 60 passes through the water removing device 62 and the second connection pipe 61 and is sucked into the second compression chamber 50 of the second compression unit 15.

  The second compression chamber 50 further compresses the air, and the air compressed in the second compression chamber 50 is sent to the air tanks 17 and 18 via the second exhaust chamber 51 and the connection pipe 72. The operator performs at least one of reducing the pressure in the air tanks 17 and 18 by the pressure reducing valve 75 and sending it to the supply pipe 76, and reducing the pressure by the pressure reducing valve 79 and sending it to the supply pipe 80. It is possible.

  The control unit 16 processes the signal of the pressure sensor 74 to detect the air pressure in the air tanks 17 and 18. The control unit 16 controls the rotation, the stop, the number of rotations, and the torque of the electric motor 13 based on the data stored in the storage unit. When the power switch is turned on, the control unit 16 controls the number of rotations and the torque of the electric motor 13 so that the air pressure in the air tanks 17 and 18 rises to the target pressure. The control unit 16 stops the electric motor 13 when the air pressure in the air tanks 17 and 18 reaches the target pressure.

  Furthermore, the cooling fan 28 rotates with the rotation shaft 25, and the air of the outside B 2 of the cover 12 is introduced into the inside B 1 of the cover 12 through the air inlet 34. When the air compressor 10 is viewed from the side as shown in FIG. 2, the air introduced into the inside B1 of the cover 12 flows in the direction D1 so as to approach the second wall 30. The air flowing through the inside B 1 cools the electric motor 13, the first compression unit 14, the second compression unit 15 and the control unit 16, and is discharged to the outside B 2 through the exhaust port 35.

  The air compressed in the first compression chamber 41 passes through the water removing device 62, whereby the water contained in the compressed air is captured and removed by the water removing device 62. The water removing device 62 removes water and dust contained in the air. For this reason, it can control that moisture and dust invade into the 2nd compression part.

  For example, when the air compressor 10 is driven and thereafter the air compressor 10 is stopped, the compressed air remaining over the first compression section 14 and the second compression section 15 is cooled to form water droplets. Can be suppressed. In addition, moisture or dust contained in the air intrudes into the second compression section 15, and adheres between the second cylinder 45 and the second piston 49 shown in FIG. Among them, at least one can be suppressed from being worn out. In addition, the air compressor 10 is stopped in a state where the compressed air remains in the second compression chamber 50, and the remaining compressed air is cooled, which can suppress the generation of water droplets. In addition, it is possible to suppress a drop in sealing performance when the second check valve 53 closes the port 52 due to water droplets or dust adhering to the second check valve 53. Therefore, the fall of the air compression performance of the 2nd compression part 15 can be controlled, and the endurance fall of air compressor 10 can be controlled.

  On the other hand, the seal member 83 attached to the first piston 40 shown in FIG. 3 is annular. Therefore, in the stopped state of the air compressor 10, the air in the first compression chamber 41 does not leak from between the first piston 40 and the first cylinder 36. That is, the pressure of the first compression chamber 41 is unlikely to be reduced, and the pressure of the air present from the first compression chamber 41 to the second compression chamber 50 is also unlikely to be reduced.

  On the other hand, in the water removing device 62 of the present disclosure, the pipe 63 is provided with the drainage port 67. Therefore, when the air compressor 10 is stopped, the air pressure in the first compression chamber 41 causes the water captured by the filter 64 to be discharged together with the air from the drain port 67 to the outside of the pipe 63. Therefore, the pressure of the compressed air in the first compression chamber 41 can be reduced while the air compressor 10 is stopped. In addition, the pressure of the compressed air remaining over the first compression chamber 41, the first connection pipe 60, the second connection pipe 61, and the second compression chamber 50 can be reduced. Therefore, when the air compressor 10 is started next time, the operation load of the first piston 40 can be reduced. Further, the accumulation of water in the air tanks 17 and 18 can be suppressed.

  Furthermore, part of the air flowing through the interior B1 flows along the rib 71. The moisture evaporating from the outlet 67 is dissipated into the air flowing along the ribs 71. Accordingly, saturation of the water trapping function of the filter 64 can be suppressed. In the air compressor 10 illustrated in FIG. 1, the water removing device 62 is disposed upstream of the control unit 16 in the air flow direction in the inside B1 of the cover 12. The cover 12 shown in FIGS. 1 and 2 may not have the rib 71.

  The water removing device 62 is supported by the crankcase 24 via clamps 68 and 69. Therefore, it is possible to suppress the water removing device 62 from vibrating relative to the crankcase 24.

  Another example of attaching the dewatering device 62 to the crankcase 24 is shown in FIG. In addition to the water removing device 62, an intermediate connection pipe 84 is provided. The intermediate connection pipe 84 is made of metal as an example and does not have a water removing function. Fittings 65 and 66 are selectively attached to the first connection pipe 60 and the second connection pipe 61 by either loosening and tightening the union nut and selecting either the water removing device 62 or the intermediate connection pipe 84. Is possible. When the intermediate connection pipe 84 is connected to the first connection pipe 60 and the second connection pipe 61, the air in the first connection pipe 60 is sent to the second connection pipe 61 through the intermediate connection pipe 84.

  Another example of arranging the control unit 16 in the interior B1 of the cover 12 is shown in FIG. In the control unit 16, a part of the arrangement area in the direction of the axis A <b> 1 overlaps a part of the arrangement area of the electric motor 13. The control unit 16 is disposed between the electric motor 13 and the side wall 32 in a direction intersecting the axis A1. The air compressor 10 shown in FIG. 6 is disposed downstream of the control unit 16 in the air flow direction D1 in the interior B1 of the cover 12. Therefore, it is possible to suppress that the air containing the moisture dissipated from the drainage port 67 touches the control portion 16 at the inside B1 of the cover 12.

  The cover 12 shown in FIG. 6 may have the rib 71 shown in FIG. 2 or may not have the rib 71. Also, the air compressor 10 shown in FIG. 6 can be attached to the first connection pipe 60 and the second connection pipe 61 by selecting either the water removing device 62 or the intermediate connection pipe 84 as in FIG. It is.

  Another example of connecting the water removal device 62 to the first connection pipe 60 and the second connection pipe 61 is shown in FIG. A first valve body 85 and a second valve body 86 are provided. The first valve body 85 is made of metal as an example, and the first valve body 85 has passages 87, 88, 89 and a solenoid valve 90. The first connection pipe 60 is attached to the first valve body 85 via a joint 91. The inside of the first connection pipe 60 and the passage 87 are connected.

  Also, an intermediate connection pipe 84 is provided, and the intermediate connection pipe 84 is attached to the first valve body 85 via a joint 92. The intermediate connection pipe 84 is made of metal as an example, and does not have a water removing function. The passage 89 and the inside of the intermediate connection pipe 84 are connected. The water removing device 62 is attached to the first valve body 85 via a joint 65. The inside of the water removing device 62 and the passage 88 are connected. The control unit 16 controls the solenoid valve 90. The solenoid valve 90 connects and disconnects the passage 87 and the passage 88, and connects and disconnects the passage 87 and the passage 89.

  The second valve body 86 is made of metal as an example, and the second valve body 86 has passages 93, 94, 95 and a solenoid valve 96. The second connection pipe 61 is attached to the second valve body 86 via a joint 97. The inside of the second connection pipe 61 and the passage 93 are connected.

  Further, the intermediate connection pipe 84 is attached to the second valve body 86 via a joint 98. The passage 95 is connected to the inside of the intermediate connection pipe 84. The water removing device 62 is attached to the second valve body 86 via a joint 66. The inside of the water removing device 62 and the passage 94 are connected. The controller 16 controls the solenoid valve 96. The solenoid valve 96 connects and disconnects the passage 93 and the passage 94, and connects and disconnects the passage 93 and the passage 95.

  The water removing device 62 and the intermediate connection pipe 84 shown in FIG. 7 are arranged in parallel to each other. The intermediate connection pipe 84 forms a passage that bypasses the water removing device 62.

  A solenoid valve 90 connects the passage 87 and the passage 88, and shuts off the passage 87 and the passage 89, and a solenoid valve 96 connects the passage 93 and the passage 94 and blocks the passage 93 and the passage 95, The air in the first connection pipe 60 passes through the inside of the water removing device 62 and is sent to the second connection pipe 61. That is, the air in the first connection pipe 60 does not pass through the middle connection pipe 84.

  A solenoid valve 90 connects the passage 87 and the passage 89, and shuts off the passage 87 and the passage 88, and a solenoid valve 96 connects the passage 93 and the passage 95 and blocks the passage 93 and the passage 94, The air in the first connection pipe 60 passes through the middle connection pipe 84 and is sent to the second connection pipe 61. That is, the air in the first connection pipe 60 does not pass through the water removing device 62.

  The water removing device 62, the intermediate connection pipe 84, the first valve body 85, and the second valve body 86 shown in FIG. 7 can also be provided in the air compressor 10 shown in FIG.

  An example in which the moisture removed by the moisture removing device 62 is discharged to the outside B2 of the cover 12 is shown in FIG. A drain pipe 101 is provided in the interior B1 of the cover 12. The drain pipe 101 may be made of metal, synthetic resin, or synthetic rubber, for example. The first end of the drainage pipe 101 is connected to the drainage port 67, and the second end of the drainage pipe 101 is disposed at the exhaust port 35.

  The air containing the moisture captured by the moisture removing device 62 passes from the drain port 67 through the inside of the drain pipe 101 and is discharged to the outside B2 of the cover 12. Therefore, air containing moisture can be suppressed from flowing through the inside B1 of the cover 12. As shown in FIG. 8, even if the control unit 16 is disposed downstream of the outlet 67 in the direction D1 in which air flows in the interior B1 of the cover 12, air containing moisture can be prevented from touching the control unit 16. It is.

  The upper wall 33 of the cover 12 shown in FIG. 8 may have the rib 71 shown in FIG. 2 or may not have the rib 71. Furthermore, the drain pipe 101 shown in FIG. 8 can also be provided in the inside B1 of the cover 12 shown in FIG.

  An example of the relationship between the matter disclosed in some embodiments of the air compressor and the matter described in the claims will be described. The air compressor 10 is an example of a gas compressor, and air is an example of a gas. The first compression unit 14 is an example of a first compression unit, and the second compression unit 15 is an example of a second compression unit. The first cylinder 36 is an example of a first cylinder, and the second cylinder 45 is an example of a second cylinder. The first compression chamber 41 is an example of a first compression chamber. The second compression chamber 50 is an example of a second compression chamber. The first piston 40 is an example of a first piston. The second piston 49 is an example of a second piston. The seal member 83 is an example of a seal ring. The piston ring 54 is an example of a piston ring. The first connecting rod 39 and the second connecting rod 48 are an example of a converter.

  The air supply unit 102 is an example of an air supply unit, and the water removing device 62 is an example of a water removing device and a pressure reducing device. The intermediate connection pipe 84 is an example of a bypass, and the cover 12 is an example of a cover. The drainage pipe 101 is an example of a drainage pipe, and the control unit 16 is an example of a control unit. The cooling fan 28 is an example of a cooling device, and the rib 71 is an example of a guide portion. The electric motor 13 is an example of a motor, and the crankcase 24 is an example of a housing. The rotating shaft 25 is an example of a rotating element. The clamps 68 and 69 are an example of a support member.

  The gas compressor is not limited to the embodiment disclosed with reference to the drawings, and can be variously modified without departing from the scope of the invention. For example, the motor may be any of an electric motor, a hydraulic motor, a pneumatic motor, and an engine. Support members that support the moisture removal device include clamps, brackets, frames, and the like. The gas to be compressed includes air and inert gas. Inert gases include nitrogen gas and noble gases. Noble gases include argon gas and helium gas.

  The second compression unit may have a structure that can further compress the air compressed by the first compression unit. For example, the second piston and the second connecting rod may be integrally provided, and the second piston and the second connecting rod may be swingable with respect to the second cylinder. An example in which the piston and the connection are integrated in the first compression portion or the second compression portion includes a first structure and a second structure. The first structure is one in which the piston and the connecting rod are integrally formed. The second structure is one in which the piston and the connecting rod are connected via the fixing element. The fixing element includes a screw member and an adhesive.

  There may be three or more compression units. Further, the tank for storing the gas compressed in the compression section may be either single or plural. In addition, the gas compressed by the compression unit may be sent to the working machine via an air hose or piping without passing through the air tank.

  The control unit may be a single unit of an electrical component or an electronic component, or may be a unit having a plurality of electrical components or a plurality of electronic components. Electrical or electronic components include processors, control circuits and modules.

  DESCRIPTION OF SYMBOLS 10 Air compressor, 12 ... Cover, 13 ... Electric motor, 14 ... 1st compression part, 15 ... 2nd compression part, 16 ... Control part, 24 ... Crankcase, 28 ... Cooling fan, 36 ... 1st cylinder, 39: first connecting rod, 40: first piston, 41: first compression chamber, 45: second cylinder, 48: second connecting rod, 49: second piston, 50: second compression chamber, 54: piston ring , 62: water removing device, 68, 69: clamp, 71: rib, 83: seal member, 84: intermediate connection pipe, 101: drainage pipe, 102: air supply portion.

Claims (12)

A first compression unit for compressing a gas, a second compression unit for further compressing the gas sent from the first compression unit, a connection between the first compression unit and the second compression unit, and A gas feed unit for sending the gas compressed in one compression unit to the second compression unit, the gas compressor comprising:
The first compression unit is
The first cylinder,
A first compression chamber formed in the first cylinder;
A first piston that compresses the gas in the first compression chamber by reciprocating in the first cylinder;
An annular seal ring attached to an outer circumferential surface of the first piston;
A first piston connected to the first piston and the rotary element and oscillating with the first piston when converting the rotational force of the rotary element to the reciprocating power of the first piston; Connecting rods,
Have
The air supply unit is
A moisture removing device for capturing moisture of the gas sent from the first compression unit to the second compression unit;
A pressure reducing device for reducing the pressure of the gas remaining from the first compression section to the second compression section;
Has a gas compressor.   The gas compressor according to claim 1, wherein the water removing device and the pressure reducing device include a hollow fiber membrane filter. The second compression unit is
The second cylinder,
A second compression chamber formed in the second cylinder;
A second piston that compresses the gas in the second compression chamber by reciprocating in the second cylinder;
A piston ring attached to an outer peripheral surface of the second piston and having a notch formed in a part in a circumferential direction;
The gas compressor according to claim 2, comprising:   The gas compressor according to any one of claims 1 to 3, wherein the air supply unit has a bypass disposed in parallel to the water removing device.   The gas compressor according to any one of claims 1 to 4, wherein the water removing device is attachable to and removable from the first compression unit and the second compression unit. A cover that covers the first compression unit, the second compression unit, and the air supply unit;
A drain pipe for discharging the water removed by the water removing device to the outside of the cover;
The gas compressor according to any one of the preceding claims, wherein is provided. A control unit that controls operation and stop of the first compression unit and the second compression unit;
A cover that covers the water removal device and the control unit;
A cooling device for introducing air outside the cover into the inside of the cover and discharging air inside the cover out of the cover;
The gas compressor according to any one of claims 1 to 5, comprising:   The gas compressor according to claim 7, wherein the water removing device is disposed upstream of the control unit in a flow direction of air inside the cover.   The gas compressor according to claim 7, wherein the water removing device is disposed downstream of the control unit in a flow direction of air inside the cover.   The gas compressor according to any one of claims 7 to 9, wherein the cover has a guide portion which guides the air flowing inside the cover to the water removing device.   The gas compression according to any one of claims 7 to 10, wherein the first compression unit and the second compression unit are disposed between the water removing device and the control unit in the acting direction of gravity. Machine. Motor,
A housing to which the first compression portion and the second compression portion are attached;
A conversion unit provided inside the housing, and converting a rotational force of the motor into an operating force of the first compression unit and the second compression unit;
A support member attached to the housing and supporting the moisture removal device;
A gas compressor according to any one of the preceding claims, wherein is provided.

Images