Air pump and air compressor equipped with the same

Abstract

An air pump that reduces high frequency components of noise caused by an inlet check valve seating on a valve seat, and an air compressor equipped with the air pump. [Solution] The device comprises a first piston rod that reciprocates within the first cylinder to change the volume of a first air chamber formed between the first cylinder, a first air supply unit having a metallic inlet check valve that opens a first intake hole that introduces air into the first air chamber during intake and closes it during exhaust, and a second air supply unit having a second piston rod that reciprocates within the second cylinder to change the volume of a second air chamber formed between the second cylinder, and a metallic inlet check valve that opens a second intake hole that introduces air into the second air chamber during intake and closes it during exhaust, and the first intake hole formed in the first air supply unit and the second intake hole formed in the second air supply unit are connected by an inlet connecting pipe that has an air intake hole that takes in air from the outside.

Description

[Technical field]

[0001] The present invention relates to A metal inlet check valve is provided. The present invention relates to an air pump and an air compressor equipped with the same, and more particularly to an air pump having two piston rods and an air compressor equipped with the same. [Background technology]

[0002] Conventionally, there is known a small air pump having a first piston rod that reciprocates within a first cylinder to change the volume of a first air chamber formed between the first cylinder and the second cylinder, and a second piston rod that reciprocates within a second cylinder to change the volume of a second air chamber formed between the first cylinder and the second cylinder (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-211708 A Summary of the Invention [Problem to be solved by the invention]

[0004] At least the inlet side (intake side) of the cylinders (first cylinder and second cylinder) of the above-mentioned air pump is provided with a metal flapper valve that functions as a check valve, and as the piston rods (first piston rod and second piston rod) reciprocate, the flapper valve repeatedly seats on and moves away from a valve seat formed in the cylinder. The inventors have found that in such air pumps, repeated seating of the flapper valve while the air pump is in operation generates an unpleasant opening and closing sound that includes high frequency components.

[0005] Therefore, the present invention is intended to solve the problems of the prior art as described above, that is, the object of the present invention is to Metal An object of the present invention is to provide an air pump that reduces high frequency components of noise caused by an inlet check valve sitting on a valve seat, and an air compressor equipped with the same. [Means for solving the problem]

[0006] The invention according to claim 1 relates to an air pump comprising: a first air supply section having a first piston rod that reciprocates within a first cylinder to change the volume of a first air chamber formed between the first cylinder and the first piston rod; a first air supply section having a metallic inlet check valve that opens a first intake hole that introduces air into the first air chamber during intake and closes it during exhaust; a second piston rod that reciprocates within a second cylinder to change the volume of a second air chamber formed between the second cylinder and the first piston rod; and a second air supply section having a metallic inlet check valve that opens a second intake hole that introduces air into the second air chamber during intake and closes it during exhaust; wherein the first intake hole formed in the first air supply section and the second intake hole formed in the second air supply section are connected by an inlet communication conduit having an air intake hole that takes in air from the outside. The inlet-side communication pipe includes a first intake member that is directly connected to the first air supply unit and has the air intake hole, a second intake member that is directly connected to the second air supply unit and has the air intake hole, and a communication pipe that directly connects the first intake member and the second intake member. By doing so, the above-mentioned problems are solved.

[0007] The invention according to claim 2 comprises, in addition to the configuration of the air pump described in claim 1, In the vicinity of a worker using an appliance that operates with air supplied by the air pump The problem mentioned above is solved by operating the device at a volume between 45dB and 55dB.

[0008] The invention of claim 3 further solves the above-mentioned problem by providing the inlet side communicating pipe with flexibility in addition to the configuration of the air pump described in claim 1 or claim 2.

[0009] The invention according to claim 4 is an air compressor for supplying compressed air to an external device, comprising: the air pump according to claim 1 or 2; an air tank communicating with an outlet of the air pump to store the air supplied from the air pump and communicating with the external device to supply the compressed air to the external device; a controller for controlling a drive motor that reciprocates a first piston rod and a second piston rod of the air pump; and a signal line extending from the controller and connected to the air tank. Other Internal communication port A housing with Equipped with , the external communication port is Controlling the controller Provided on the outside of the housing Freely connectable to signal lines extending from external control devices is This solves the above-mentioned problems.

[0010] The invention of claim 5 solves the above-mentioned problem by, in addition to the configuration of the air compressor described in claim 4, providing a pressure gauge that measures the internal pressure of the air tank, and the controller connected to the pressure gauge outputs the internal pressure value of the air tank to the external control device. Effect of the Invention

[0011] According to the air pump of the invention of claim 1, the first air intake hole formed in the first air supply part and the second air intake hole formed in the second air supply part are communicated with each other by an inlet side communication pipe having an air intake hole for taking in air from the outside. The inlet-side communication pipe is composed of a first intake member directly connected to the first air supply unit and having an air intake hole, a second intake member directly connected to the second air supply unit and having an air intake hole, and a communication pipe directly connecting the first intake member and the second intake member. As a result, the force generated by the reciprocating motion of the first piston rod is Metal When the first intake port is opened and closed by the inlet check valve, or when the second piston rod reciprocates, Metal When the second intake port is opened and closed by the inlet check valve, Metal The harsh high frequency components of the impact noise caused by the inlet check valve seating on the valve seat are attenuated by the air present in the inlet connecting pipe. Metal It is possible to reduce the high frequency components of noise caused by the inlet side check valve seating on the valve seat.

[0012] According to the air pump of the invention according to claim 2, in addition to the effects of the air pump of the invention according to claim 1, In the vicinity of a worker using equipment powered by air supplied by an air pump By operating the air pump at a volume of 45 dB or more and 55 dB or less, the noise level of the air pump's operation will be at a level that occurs in everyday life, so the health of the worker can be maintained even if the air pump is placed in the vicinity of a worker who uses equipment that is powered by the air supplied by the air pump.

[0013] According to the air pump of the invention of claim 3, in addition to the effects achieved by the air pump of the invention of claim 1 or 2, the inlet side communicating conduit has flexibility, so that when the air pump is placed inside the housing, the inlet side communicating conduit deforms depending on the degree of interference with the housing, making it easier to make the housing smaller.

[0014] According to the air compressor of the invention of claim 4, in addition to the effects of the air pump of the invention of claim 1 or claim 2, the air compressor connected to the signal line extending from the controller has the following advantages: Other Internal communication port A housing with Equipped with , the external communication port is Controlling the controller Installed on the outside of the housing Freely connectable to signal lines extending from external control devices is By doing so, Installed outside the air compressor An external control device that controls the controller can be connected to the air compressor. Installed outside the air compressor The operation of the air compressor can be controlled by an external control device.

[0015] According to the air compressor of the invention defined in claim 5, in addition to the effects achieved by the air compressor of the invention defined in claim 4, the controller connected to the pressure gauge outputs the internal pressure value of the air tank to an external control device, which enables the external control device to control the drive of the air compressor according to the internal pressure value of the air tank. Therefore, the air pump drive motor can be driven according to the usage environment of the air compressor, thereby minimizing the time for which noise is generated by the air compressor. [Brief description of the drawings]

[0016] [Figure 1A] 1 is a perspective view showing the front, right side, and top of an air compressor 10 according to an embodiment of the present invention. FIG. [Figure 1B] 1 is a perspective view showing the rear, left side, and bottom of an air compressor 10 according to an embodiment of the present invention. FIG. [Diagram 2] FIG. 1B is a piping diagram of the air compressor 10 shown in FIG. 1A. [Figure 3A] FIG. 3 is a front view of the air pump 100 shown in FIG. [Figure 3B] FIG. 3 is a left side view of the air pump 100 shown in FIG. 2. [Figure 4] Partial cross-sectional view of IIIA-IIIA in FIG. 3A. [Diagram 5] Cross-sectional view of FIG. 3B along IIIB-IIIB. [Figure 6] Cross-sectional view taken along line VI-VI in Figure 5 . [Figure 7] Cross-sectional view taken along line VII-VII of FIG. 3B. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The air pump of the present invention is an air pump comprising: a first air supply section having a first piston rod that reciprocates within a first cylinder to change the volume of a first air chamber formed between the first cylinder and the first piston rod; a first air supply section having a metallic inlet check valve that opens a first intake hole that introduces air into the first air chamber during intake and closes it during exhaust; a second piston rod that reciprocates within a second cylinder to change the volume of a second air chamber formed between the second cylinder and the second piston rod; and a second air supply section having a metallic inlet check valve that opens a second intake hole that introduces air into the second air chamber during intake and closes it during exhaust; and the first intake hole formed in the first air supply section and the second intake hole formed in the second air supply section are connected by an inlet communication conduit having an air intake hole that takes in air from the outside. The inlet-side communication pipe is composed of a first intake member directly connected to the first air supply unit and having an air intake hole, a second intake member directly connected to the second air supply unit and having an air intake hole, and a communication pipe directly connecting the first intake member and the second intake member. , Metal The specific embodiment may be any embodiment as long as it reduces the high frequency components of the noise caused by the inlet check valve sitting on the valve seat.

[0018] For example, an air compressor equipped with the air pump of the present invention can be used in a cooperative robot such as a robot arm. Robots, AMR (autonomous mobile robots), AGV (automated guided vehicles) It must be built into an external device that uses compressed air, such as a feed robot or an analytical device. is preferred, but is not limited thereto. EXAMPLES

[0019] Hereinafter, an air compressor 10 according to an embodiment of the present invention will be described with reference to FIGS. The air pump 100 incorporated in the air compressor 10 will now be described. Air Compressor 10 is an AMR (Autonomous Mobile Robot) or AGV (Automated Guided Vehicle It is built into external devices that use compressed air, such as transport robots and analytical equipment, and It supplies compressed air to pneumatic devices in external equipment that require air pressure.

[0020] <1.Appearance of Air Compressor 10> First, the external appearance of an air compressor 10 will be described with reference to FIGS. 1A and 1B. FIG. 1A is a perspective view showing the front, right side, and top of an air compressor 10 according to one embodiment of the present invention, and FIG. 1B is a perspective view showing the back, left side, and bottom of air compressor 10 according to one embodiment of the present invention.

[0021] As shown in FIGS. 1A and 1B, the air compressor 10 has a height of, for example, 10 cm and a base area of ​​310 cm. 2 This is a small air compressor consisting of a rectangular parallelepiped housing 11 of about

[0022] A power switch 12 for turning the air compressor 10 on and off is provided on the front surface of the housing 11. It should be noted that power is supplied to the air compressor 10 through a power cord (not shown) connected to the rear surface of the housing 11.

[0023] As shown in FIG. 1A, a heat dissipation hole 11a is formed on the left side surface of the housing 11 to dissipate heat inside the housing to the outside. The number and shape of the heat dissipation holes 11a may be any as long as they can dissipate heat inside the housing to the outside of the housing, and are not limited to the number and shape shown in FIG. 1A.

[0024] Further, on the left side surface of the housing 11, an intake hole 11b is formed for taking in air into the inside of the housing 11, as shown in FIG. 1B. The number and shape of the intake holes 11b may be any as long as they can take in air into the air compressor 10, and are not limited to the number and shape shown in FIG. 1B.

[0025] An external communication port 13 is provided at the upper part of the rear surface of the housing 11, which can be freely connected to a signal line extending from an external control device. Of the external communication ports 13, the first external communication port 13a is a port for performing serial communication such as RS-485 with a computer, etc., and the second external communication port 13b is an I / O port (input / output port) for connecting to, for example, a PLC (Programmable Logic Controller) etc. Therefore, in the air compressor 10 of this embodiment, an external control device can be connected to the air compressor 10, so that the operation of the air compressor 10 can be controlled by the external control device.

[0026] An outlet 14 is formed at the lower part of the rear surface of the housing 11 and can be freely connected to an air pipe extending from an air pressure device of an external device.

[0027] <2. Flow path configuration of air compressor 10> Next, the flow path configuration of air compressor 10 will be described with reference to FIG. 2 which is a piping system diagram of air compressor 10 shown in FIG. 1A.

[0028] As shown in FIG. 2, the air compressor 10 includes an air pump 100, an air tank 200 that communicates with the outlet of the air pump 100 and stores the air supplied from the air pump 100, a pressure gauge 300 that is connected to the air tank 200 and measures the internal pressure of the air tank 200, a check valve 400 that is disposed between the air pump 100 and the air tank 200 and prevents air from flowing back from the air tank 200 to the air pump 100, and a relief valve 500 that is connected to the outlet of the air tank 200 and reduces the pressure in the air tank 200 to a predetermined pressure value or lower.

[0029] As shown in FIG. 1A, the pressure gauge 300 has a display / operation unit 310 on the surface of the housing 11 for displaying the internal pressure value of the air tank 200 and for operating the pressure gauge 300.

[0030] The air compressor 10 also includes a controller 600 that is electrically connected to the electrically powered components of the air pump 100 and the pressure gauge 300 . The controller 600 has a signal line 610 one end of which is connected to the external communication port 13 . Therefore, with the signal line EC1 extending from the external control device EC connected to the external communication port 13, the controller 600 connected to the pressure gauge 300 outputs the internal pressure value of the air tank 200 to the external control device EC, thereby enabling the external control device EC to control the drive of the air compressor 10 in accordance with the internal pressure value of the air tank 200. Therefore, in the air compressor 10 of this embodiment, the air pump 100 can be driven according to the environment in which the air compressor 10 is used, thereby minimizing the time during which noise is generated by the air compressor 10.

[0031] <3. Air pump structure> Next, the air pump 100 will be described in detail with reference to FIGS. 3A is a front view of air pump 100 shown in FIG. 2, FIG. 3B is a left side view of air pump 100 shown in FIG. 2, FIG. 4 is a partial cross-sectional view taken along IIIA-IIIA in FIG. 3A, FIG. 5 is a cross-sectional view taken along IIIB-IIIB in FIG. 3B, FIG. 6 is a cross-sectional view taken along VI-VI in FIG. 5, and FIG. 7 is a cross-sectional view taken along VII-VII in FIG. 3B.

[0032] As shown in Figures 3A and 3B, the air pump 100 is composed of a rectangular parallelepiped drive unit 110, a first air supply section 120 connected to the left side of the drive unit 110, a second air supply section 130 connected to the right side of the drive unit 110, a flow path forming member 140 attached to the front of the drive unit 110, and an inlet side connecting pipe 150 that connects the first air supply section 120 and the second air supply section 130.

[0033] The noise level of this air pump 100 is about 45 dB to 55 dB. Therefore, since the operating noise of the air pump 100 is at a noise level that occurs on an everyday basis, the health of the worker can be maintained even if the air pump 100 is placed in the vicinity of a worker using equipment that operates using the air supplied by the air pump 100.

[0034] <3.1. Drive unit> As shown in Figures 5 and 6, the drive unit 110 has a housing 111, a drive motor 112 mounted on the housing 111, a base 113 that rotates integrally with the drive motor 112, and an upper crank 114 and a lower crank 115 connected to the base 113.

[0035] The drive motor 112 is connected to the controller 600 and is controlled by the controller 600 .

[0036] As shown in FIG. 6, the base 113 has a cylindrical tubular portion 113a into which the motor shaft 112a hanging down from the drive motor 112 is inserted, and a hollow disk-shaped portion 113b connected to the lower end of the cylindrical portion 113a, and is fixed to the motor shaft 112a by fixing screws (not shown). Therefore, the base 113 rotates integrally with the motor shaft 112a.

[0037] As shown in FIG. 6 and other figures, an upper key 113c and a lower key 113d are attached to the cylindrical portion 113a of the base 113. The upper key 113c and the lower key 113d are located below the upper key 113c. As shown in FIG. 6, the upper key 113c and the lower key 113d are provided at positions facing each other (positions shifted by 180 degrees) with respect to the motor shaft 112a.

[0038] As shown in Figures 5 and 6, the upper crank 114 is composed of a hollow, disk-shaped crank base 114a that engages with an upper key 113c attached to the base 113 and rotates integrally with the base 113, a crank body 114b consisting of an annular portion and a square portion protruding from the annular portion, and a radial bearing 114c arranged between the crank base 114a and the crank body 114b.

[0039] As shown in FIG. 5, the center of the crank base 114a is eccentric to the axis of the motor shaft 112a. As shown in FIG. 5, the center of the crank body 114b coincides with the center of the crank base 114a, the center of the radial bearing 114c, and the center of the annular portion of the crank body 114b. Therefore, when the motor shaft 112a rotates, the crank body 114b reciprocates in the left and right directions.

[0040] As shown in FIG. 6, the lower crank 115 is composed of a hollow, disk-shaped crank base 115a that engages with a lower key 113d attached to the base 113 and rotates integrally with the base 113, a crank body 115b consisting of an annular portion and a square portion protruding from the annular portion, and a radial bearing 115c arranged between the crank base 115a and the crank body 115b.

[0041] The center of the crank base 115a, like the center of the crank base 114a of the upper crank 114, is eccentric with the axis of the motor shaft 112a. Like the upper crank 114, the center of the crank body 115b coincides with the center of the crank base 115a, the center of the radial bearing 115c, and the center of the annular portion of the crank body 115b. Therefore, when the motor shaft 112a rotates, the crank body 115b also reciprocates in the left and right directions.

[0042] <3.2. First air supply section> As shown in Figures 5 and 6, the first air supply section 120 has a cylindrical first cylinder 121 inserted into the left side surface of the housing 111 of the drive unit 110, a first piston rod 122 connected to the crank body 114b of the drive unit 110 to close one end side of the first cylinder 121 and reciprocating within the first cylinder 121, a cover member 123 that closes the other end side of the first cylinder 121, a flow path member 124 attached to this cover member 123, a heat sink 125 affixed to this flow path member 124, and an inlet side joint 126 and an outlet side joint 127 connected to the flow path member 124. Therefore, in the first air supply section 120, the first cylinder 121, the first piston rod 122, and the cover member 123 form a first air chamber AC1 as shown in FIG. The first piston rod 122 reciprocates within the first air chamber AC1 to change the volume of the first air chamber AC1.

[0043] As shown in Figures 5 and 6, the first piston rod 122 is composed of a disk-shaped piston body 122a, a sealing member 122b that covers the outer periphery of the piston body 122a and seals the space between it and the first cylinder 121, and a connecting bolt 122c that connects the piston body 122a to the crank body 114b of the drive unit 110. Therefore, the first piston rod 122 is reciprocated within the first air chamber AC1 by the drive motor 112 of the drive unit 110.

[0044] The cover member 123 is a rectangular plate-shaped member and, as shown in FIG. 5, has an inlet hole (first air intake hole) 123a for introducing air into the first air chamber AC1 and an exhaust hole 123b for discharging air from the first air chamber AC1.

[0045] As shown in FIGS. 5 and 6, a metallic flap-shaped inlet check valve 123c is provided at the outlet end of the introduction hole 123a to prevent air from flowing from the first air chamber AC1 into the introduction hole 123a. That is, the inlet check valve 123c opens the introduction hole 123a during intake and contacts the valve seat 123d to close the introduction hole 123a during exhaust.

[0046] As shown in FIGS. 4 and 5, an outlet-side check valve 123e is provided at the outlet end of the exhaust hole 123b to prevent air from flowing into the first air chamber AC1 from the exhaust hole 123b. Further, a stopper 123f for limiting the opening degree of the outlet side check valve 123e is provided at the outlet end of the exhaust hole 123b.

[0047] The flow path member 124 is a rectangular plate-shaped member, and as shown in Figures 4 and 5, has an inlet flow path 124a extending forward from the rear surface of the flow path member 124 and communicating with the introduction hole 123a of the cover member 123, and an outlet flow path 124b communicating with the exhaust hole 123b of the cover member 123 and extending toward the front surface of the flow path member 124.

[0048] As shown in FIGS. 3B and 4, the inlet side joint 126 is an L-shaped joint connected to the rear end side of the flow path member 124, and the downstream end thereof communicates with the inlet flow path 124a of the flow path member 124.

[0049] As shown in FIGS. 3B and 4, the outlet side joint 127 is a straight joint connected to the front end side of the flow path member 124, and the upstream end thereof communicates with the outlet flow path 124b of the flow path member 124.

[0050] <3.3. Second air supply section> As shown in Figures 5 and 6, the second air supply section 130 has a cylindrical second cylinder 131 inserted into the right side of the housing 111 of the drive unit 110, a second piston rod 132 connected to the crank body 114b of the drive unit 110 to close one end of the second cylinder 131 and reciprocate within the second cylinder 131, a cover member 133 that closes the other end of the second cylinder 131, a flow path member 134 attached to this cover member 133, a heat sink 135 affixed to this flow path member 134, and an inlet side joint 136 and an outlet side joint 137 connected to the flow path member 134. Therefore, in the second air supply section 130, the second cylinder 131, the second piston rod 132, and the cover member 133 form a second air chamber AC2 as shown in FIG. The second piston rod 132 reciprocates within the second air chamber AC2 to change the volume of the second air chamber AC2.

[0051] As shown in FIG. 6, the second piston rod 132 is composed of a disk-shaped piston body 132a, a sealing member 132b that covers the outer periphery of the piston body 132a and seals the space between it and the second cylinder 131, and a connecting bolt 132c that connects the piston body 132a to the crank body 115b of the drive unit 110. Therefore, the second piston rod 132 is reciprocated within the second air chamber AC2 by the drive motor 112 of the drive unit 110.

[0052] The cover member 133 is a rectangular plate-shaped member and, as shown in Figures 5 and 6, has an inlet hole (second air intake hole) 133a for introducing air into the second air chamber AC2 and an exhaust hole 133b for exhausting air from the second air chamber AC2.

[0053] As shown in FIG. 5, a metallic flap-shaped inlet check valve 133c is provided at the outlet end of the introduction hole 133a to prevent air from flowing from the second air chamber AC2 into the introduction hole 133a. That is, the inlet check valve 133c opens the introduction hole 133a during intake and closes it by coming into contact with the valve seat 133d during exhaust.

[0054] As shown in FIG. 6, an outlet-side check valve 133e is provided at the outlet end of the exhaust hole 133b to prevent air from flowing into the second air chamber AC2 from the exhaust hole 133b. As shown in FIG. 6, a stopper 133f for limiting the opening degree of the outlet side check valve 133e is provided at the outlet end of the exhaust hole 133b.

[0055] The flow path member 134 is a rectangular plate-shaped member and, as shown in Figure 5 etc., has an inlet flow path 134a extending forward from the rear surface of the flow path member 134 and communicating with the introduction hole 133a of the cover member 133, and an outlet flow path 134b communicating with the exhaust hole 133b of the cover member 133 and extending toward the front surface of the flow path member 134.

[0056] As shown in FIG. 5 and other figures, the inlet joint 136 is an L-shaped joint connected to the rear end side of the flow path member , and its downstream end communicates with the inlet flow path a of the flow path member .

[0057] As shown in FIG. 5 and other figures, the outlet side joint 137 is a straight joint connected to the front end side of the flow path member 134, and its upstream end communicates with the outlet flow path 134b of the flow path member 134.

[0058] <3.4. Flow path forming member> As shown in FIG. 3B, the flow path forming member 140 is disposed in front of the drive unit 110. This flow path forming member 140 has a plate material 141, a hollow connecting member 142 that connects this plate material 141 to the outlet side joint 127 of the first air supply section 120 and the outlet side joint 137 of the second air supply section 130 as shown in Figure 4, and an upper joint 143 provided on the upper surface of the plate material 141.

[0059] The plate material 141 is a rectangular plate-shaped member as shown in FIG. 3, and has a horizontal flow path 141a extending in the left-right direction as shown in FIG. 7, and an upper flow path 141b extending upward from near the center of the horizontal flow path 141a.

[0060] As shown in FIG. 7, the horizontal flow path 141a is a through-hole that passes through the plate material 141 in the left-right direction. Channel sealing plugs 144 that seal both ends of the horizontal channel 141a are inserted into both ends of the horizontal channel 141a.

[0061] The outlet end of the upper fitting 143 is connected to an air supply line Ta which communicates with a check valve 400 as shown in FIG. 3A.

[0062] <3.5. Inlet side communication pipe> As shown in FIG. 3A, the inlet side communication pipe 150 includes a first intake member 151 connected to the first air supply unit 120, a second intake member 152 connected to the second air supply unit 130, and a communication pipe that connects the first intake member 151 and the second intake member 152. tube 1 It consists of 53 There are.

[0063] As shown in FIG. 3B, the first intake member 151 has a three-way joint 151a and a filter 151b having an air intake hole connected to a connection port on the front side of the three-way joint 151a. The three-way joint 151a has a connecting port on the upper side. tube 1 One end of 53 is connected. One end of a connection pipe 151c that connects to the inlet side of the inlet side joint 126 of the first air supply unit 120 is connected to a connection port on the lower side of the three-way joint 151a. Therefore, the first intake member 151 tube 1 53 communicates with the introduction hole 123 a of the first air supply section 120 .

[0064] As shown in FIG. 3A, the second air intake member 152 has a three-way joint 152a and a filter 152b having an air intake hole that is connected to the connection port on the front side of the three-way joint 152a. The three-way joint 152a has a connecting port on the upper side. tube 1 The other end of 53 is connected. One end of a connection pipe 152c that connects to the inlet side of the inlet side joint 136 of the second air supply section 130 is connected to a connection port on the lower side of the three-way joint 152a. Therefore, the second intake member 152 tube 1 53 communicates with the introduction hole 133 a of the second air supply section 130 .

[0065] A communication hole that communicates with the inlet hole 123a of the first air supply unit 120 and the inlet hole 133a of the second air supply unit 130. tube 1 Reference numeral 53 denotes an arch-shaped pipe made of resin and has flexibility.

[0066] <4. Air flow in the air compressor> Next, the air flow in the air compressor 10 will be described with reference to FIGS. 1B, 2, 4, 5, and 7.

[0067] When the drive motor 112 rotates and the first piston rod 122 moves away from the lid member 123 and the second piston rod 132 moves away from the lid member 133, the first air chamber AC1 and the second air chamber AC2 tend to become negative pressure, and the air pump 100 takes in air from the outside. Therefore, the air compressor 10 takes in air A through the intake hole 11b as shown in FIG. 1B.

[0068] Air A taken into air compressor 10 is taken into the inside of air pump 100 through air intake holes (filters 151b, 152b) of air pump 100, as shown in FIGS.

[0069] As shown in FIG. 4, air A taken in through the filter 151b of the air pump 100 is tube 1 While filling the inside of 53, the air flows into the first air supply section 120 via the connecting pipe 151c. The air A taken in through the filter 152b of the air pump 100 is passed through a connecting tube 1 While filling the inside of 53, the air flows into the second air supply section 130 via the connecting pipe 152c. Hereinafter, the flow of air A in the second air supply section 130 is similar to the flow of air A in the first air supply section 120, and therefore a description thereof will be omitted.

[0070] Air A that has flowed into the first air supply unit 120 flows through the inlet flow path 124a of the flow path member 124 and the introduction hole 123a of the cover member 123 into the first air chamber AC1, as shown in FIG.

[0071] Then, when the drive motor 112 rotates further and the first piston rod 122 approaches the cover member 123, the air in the first air chamber AC1 flows into the flow path forming member 140 via the exhaust hole 123b of the cover member 123, the outlet flow path 124b of the flow path member 124, and the outlet side joint 127.

[0072] Air A that has flowed into flow path forming member 140 flows out from horizontal flow path 141a, upper flow path 141b, and outlet 143a of upper joint 143, as shown in FIG.

[0073] Air A flowing out from outlet 143a of air pump 100 passes through air supply pipe Ta and check valve 400, as shown in FIG.

[0074] The air A stored in the air tank 200 is compressed and discharged from the discharge port 14 to an external device.

[0075] <5. Effects> According to air pump 100 which is one embodiment of the present invention described above, introduction hole 123a which is a first intake hole formed in first air supply section 120 and introduction hole 133a which is a second intake hole formed in second air supply section 130 are communicated by inlet side communication conduit 150 which has an air intake hole for taking in air from the outside. Therefore, when introduction hole 123a is opened and closed by inlet side check valve 123c accompanying the reciprocating motion of first piston rod 122, or When the inlet side check valve 133c opens and closes the introduction hole 133a in conjunction with the reciprocating movement of the second piston rod 132, the harsh high-frequency components of the impact noise caused by the inlet side check valves 123c, 133c seating on the valve seats 123d, 133d are attenuated by the air present in the inlet side communicating pipe 150, so that the high-frequency components of the noise caused by the inlet side check valves 123c, 133c seating on the valve seats 123d, 133d when the air pump 100 is operated can be reduced.

[0076] In addition, the inlet side communication pipe 150 tube 1 Since the air pump 100 is flexible, the air flow path 53 can be adjusted according to the degree of interference with the housing 11 when the air pump 100 is placed in the housing 11. tube 1 Since 53 is deformable, the housing 11 can be easily made smaller.

[0077] <Modification> The above describes the air pump 100 as one embodiment of the present invention and the air compressor 10 equipped with the same. However, the air pump and air compressor of the present invention are not limited to the air pump 100 and air compressor 10 of the above-described embodiment.

[0078] For example, in this embodiment, the inlet side communication pipe 150 has two air intake holes, but the number of air intake holes in the inlet side communication pipe may be at least one. In this embodiment, the inlet side communication pipe 150 communicates with the first intake member 151 and the second intake member 152. tube 1 However, any pipe may be used as long as it can connect the inlet side of the first air supply unit 120 and the inlet side of the second air supply unit 130 and has an air intake hole. [Explanation of symbols]

[0079] 10. Air Compressor 11. Housing 11a... Waste heat hole 11b...Intake hole 12 Power switch 13 External communication port 13a First external communication port 13b Second external communication port 14...Discharge port 100 ··· Air pump 110 Drive unit 111 ··· Housing 112 Drive motor 112a Motor shaft 113 ··· Base 113a: Cylindrical portion 113b...Disc section 113c ··· Upper key 113d ··· Lower key 114 Upper crank 114a ··· Crank base 114b Crank body 114c Radial bearing 115 Lower crank 115a ··· Crank base 115b Crank body 115c Radial bearing 120 First air supply unit 121 - First cylinder 122 First piston rod 122a Piston body 122b .... Seal member 122c Connecting bolt 123 ... Lid member 123a: Inlet hole (first intake hole) 123b Exhaust hole 123c Inlet check valve 123d ··· Valve seat 123e... Outlet side check valve 123f ··· Stopper 124 Flow path member 124a... Inlet channel 124b: Outlet passage 125 Heat sink 126 Inlet side fitting 127 Outlet side fitting 130 Second air supply section 131 21st cylinder 132 Second piston rod 132a Piston body 132b .... Seal member 132c Connecting bolt 133 ... Lid member 133a: Inlet hole (second intake hole) 133b Exhaust hole 133c Inlet check valve 133d ··· Valve seat 133e... Outlet side check valve 133f Stopper 134 Flow path member 134a... Inlet channel 134b: Outlet passage 135 Heat sink 136 Inlet side joint 137 Outlet side fitting 140 Flow path forming member 141 ··· Board material 141a...Horizontal channel 141b Upper flow path 142 ...connecting member 143 Upper joint 143a...exit 144 Flow passage sealing plug 150... Inlet side communication pipe 151 First intake member 151a Three-way joint 151b ··· Filter 151c Connecting pipe 152 Second intake member 152a Three-way joint 152b ··· Filter 152c Connecting pipe 153 ... communication tube 200 ··· Air tank 300 ··· Pressure gauge 310...Display operation section 400 ··· Check valve 500 ··· Relief valve 600 ··· Controller 610 Signal line EC: External control device EC1... Signal line AC1: First air chamber AC2: Second Air Chamber Ta Air supply pipe A: Air

Claims

1. a first air supply unit having a first piston rod that reciprocates within a first cylinder to change the volume of a first air chamber formed between the first cylinder and the first piston rod, and a metallic inlet check valve that opens a first intake hole that introduces air into the first air chamber during intake and closes it during exhaust; an air pump including a second air supply unit having a second piston rod that reciprocates within a second cylinder to change a volume of a second air chamber formed between the second cylinder and the second piston rod, and a metal inlet check valve that opens a second intake hole that introduces air into the second air chamber during intake and closes it during exhaust, a first air intake hole formed in the first air supply section and a second air intake hole formed in the second air supply section are communicated with each other through an inlet side communication pipe having an air intake hole for taking in air from the outside, An air pump characterized in that the inlet side connecting pipe is composed of a first intake member that is directly connected to the first air supply unit and has the air intake hole, a second intake member that is directly connected to the second air supply unit and has the air intake hole, and a connecting pipe that directly connects the first intake member and the second intake member.

2. An air pump as described in claim 1, characterized in that it operates at a volume of 45 dB or more and 55 dB or less in the vicinity of a worker using an instrument that operates with air supplied by the air pump.

3. 3. The air pump according to claim 1, wherein the inlet side communication pipe is flexible.

4. An air compressor that supplies compressed air to an external device, The air pump according to claim 1 or 2, an air tank communicating with an outlet of the air pump to store the air supplied from the air pump and communicating with the external device to supply the compressed air to the external device; a controller that controls a drive motor that reciprocates a first piston rod and a second piston rod of the air pump; a housing having an external communication port connected to a signal line extending from the controller; An air compressor characterized in that the external communication port is freely connectable to a signal line extending from an external control device provided outside the housing and controlling the controller.

5. A pressure gauge is provided to measure the internal pressure of the air tank, 5. The air compressor according to claim 4, wherein the controller connected to the pressure gauge outputs the internal pressure value of the air tank to the external control device.

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