JP2006002688A - Vane rotary type air pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vane rotary type air pump capable of silent operation by suppressing leak of sliding noise of a vane and expansion noise of air by leak of compressed air produced in a pump space from a suction opening during pump operation without increasing pump dimensions. <P>SOLUTION: Since sliding noise of the vane 109 and expansion noise due to leak of compressed air leaking out of the pump space 104 is not directly released out of the air pump and is attenuated and absorbed in a suction route by forming the suction route having one or more bends in a front plate 111, noise leaking out of the pump can be suppressed without expanding a pump outer diameter. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vane rotary type air pump used for an air supply device of a mobile information terminal device using a fuel cell.

  Conventionally, as this kind of vane rotary type pump, there existed what was described in patent documents 1, for example. FIG. 6 shows a configuration of a conventional vane rotary pump described in Patent Document 1. In FIG.

  The vane rotary type air pump shown in FIG. 6 includes a motor unit (not shown) and a pump mechanism unit 101 driven by the motor unit. The pump mechanism 101 includes a flat end plate 112, a cylinder 103 positioned on the side opposite to the motor portion of the end plate 112, and a front plate 111 that sandwiches the cylinder 103 together with the end plate 112. The cylinder 103 has a cylindrical shape in which the inner hole has a uniform diameter, and the end plate 112 and the front plate 111 are coupled to each other in an airtight manner. Therefore, the pump mechanism 101 defines the pump space 104 by the inner peripheral wall surface of the cylinder 103 and the side wall surfaces of the end plate 112 and the front plate 111. The axis of the mechanical shaft 110 is eccentric with respect to the center of the inner peripheral wall surface of the cylinder 103, the rotation center of the rotor 107 coincides with the axis of the mechanical shaft 110, and is located on the same axis. It is integral with the mechanical shaft 110 in the rotational direction.

  The rotor 107 includes a plurality of vane slits 108 for storing vanes 109 made of carbon or the like. The plurality of vane slits 108 are arranged at equal intervals around the center of the rotor 107, and each vane slit 108 extends from the outer peripheral surface of the rotor 107 to a radially intermediate portion. Each vane 109 that has entered each vane slit 108 receives the action of centrifugal force as the rotor 107 rotates, and rotates together with the rotor 107 while the tip portion in the radial direction contacts the inner peripheral wall surface of the cylinder 103. Therefore, each vane 109 partitions the pump space 104 around the rotor 107 together with the rotor 107 and the casing parts (the cylinder 103, the end plate 112, and the front plate 111).

The configuration of each pump space 104 in the pump mechanism 101 is clarified in FIG. 6B showing a cross-sectional structure, and the pump action of the pump mechanism 101 can be known from FIG. 6B. . As shown in FIG. 6B, the cylinder 103 is provided with a suction port 131 and a discharge port 115. Since the rotation center of the rotor 107 and the center of the inner wall of the cylinder 103 are eccentric, the pump space 104 around the rotor 107 changes its volume as the rotor 107 rotates. For example, when the rotor 107 rotates counterclockwise in FIG. 8, the pump space 104 facing the suction port 131 increases in volume with rotation and then decreases in volume. The pump space 104 whose volume increases with rotation functions as a suction chamber, and the pump space 104 whose volume decreases with rotation functions as a discharge chamber. The suction port 131 is located at the center in the axial direction of the internal space and communicates with the pump space 104.
JP-A 62-276291

However, in the conventional configuration, since the suction port penetrates the pump space, the friction between the vane tip and the cylinder inner surface during the pump operation, the sliding noise generated by the friction between the vane side surface and the vane slit, and the vane end surface The sliding noise generated by the friction between the end plate and the front plate and the expansion sound of the air generated when the air compressed in the pump space leaks into the previous low pressure pump space are directly from the pump space. Since it leaked out of the pump through the suction port, there was a problem that noise during pump operation was large.

  The present invention solves the above-described conventional problems, and even during pump operation, sliding noise between vanes and cylinders, vane slits, end plates and front plates, and leakage of compressed air generated in the pump space. It is an object of the present invention to provide a vane rotary type air pump that can suppress the leakage of air expansion sound from the suction port and can be operated silently.

  In order to solve the conventional problem, the vane rotary type air pump according to claim 1 of the present invention is formed by forming a suction path having one or more bends in the front plate. As a result, even during pump operation, the sliding noise between the vane and the cylinder inner wall, the vane and the vane slit, the vane and the end plate and the front plate, and the expansion sound of the air due to the leakage of compressed air generated in the pump space. Noise leaking from the suction port can be attenuated, and silent operation is possible.

  The vane rotary type air pump of the present invention can reduce noise generated from the pump during operation.

  According to the first aspect of the present invention, a suction path having one or more bends is formed in the front plate, so that the sliding between the vane and the inner wall of the cylinder, the vane and the vane slit, the vane and the end plate or the front plate is performed during the pump operation. In order to attenuate the noise caused by leakage from the suction port of dynamic noise and air expansion sound due to compressed air leakage generated in the pump space, it is attenuated in the suction path of the front plate without directly opening it to the outside of the pump. Noise that leaks from the suction port to the outside of the pump can be suppressed, and silent operation is possible.

  In the second invention, since the sound attenuation rate is improved by setting the bending angle of the suction path of the first invention to 60 degrees to 120 degrees, further noise reduction is possible.

  In the third invention, in the first or second invention, by filling the sound absorption material having air permeability in the middle of the suction route, in addition to the noise attenuation effect in the route, the noise absorption by the sound absorption material is possible. Therefore, further noise reduction is possible.

  In the fourth invention, in the first or second invention, by providing a sound absorbing material on the wall surface in the middle of the suction path, the suction loss when the intake air passes through the sound absorbing material is reduced, and the suction flow rate is reduced. While suppressing, it is possible to further suppress noise leaking from the suction port to the outside of the pump.

  According to a fifth invention, in the first to fourth inventions, by providing a throttle part in the middle of the suction path, in addition to attenuation of noise leaking from the suction port in the suction path, the muffler effect in the throttle part Since noise reduction is also possible, further noise reduction is possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 and 2 are cross-sectional views of a vane rotary type air pump according to Embodiment 1 of the present invention. 1 and 2, the vane rotary type air pump includes a pump mechanism 101 and a DC motor 119.

  A cylindrical rotor 107 is disposed in a cylinder 103 having a cylindrical inner wall in a state of being eccentric from the central axis of the inner wall of the cylinder 103. The rotor 107 is provided with a plurality of vane slits 108 in the direction of the central axis. A plate-like vane 109 made of a self-lubricating material is fitted in the vane slit 108 in a slidable state, and the end face of the cylinder 103 is inserted so that the front plate 111 and the end plate 112 sandwich the rotor 107 and the vane 109. A plurality of pump spaces 104 are formed by disposing them.

  A mechanical shaft 110 that also serves as a motor shaft of a DC motor 119 disposed on the non-mechanical side of the end plate 112 is coupled to the central axis of the rotor 107, and the rolling bearing 116 and the end plate 112 that are press-fitted into the front plate 111 are coupled to the central shaft. The pump mechanism 101 is configured by being rotatably supported by the press-fitted rolling bearing 118.

  In the DC motor 119, a stator 120 is disposed on the outer periphery of a motor rotor 121, and a mechanical shaft 110 that also serves as a motor shaft is supported by a bearing 122 and a bearing 123.

  According to such a configuration unit, a current input from a power supply unit (not shown) is obtained, and the motor rotor 121 obtains a rotational torque and rotates by a magnetic action between the motor rotor 121 and the stator 120. A mechanical shaft 110 that also serves as a motor shaft integrally formed with the motor rotor 121 is rotatably supported by bearings 122 and 123, so that a rotational force can be transmitted to the pump mechanism unit 101.

  The rotational force output from the DC motor 119 is transmitted to the rotor 107 coupled to the mechanical shaft 110 that also serves as the motor shaft. Along with the rotation of the rotor 107 that has obtained the rotational force, the vane 109 jumps out along the vane slit 108 provided in the central axis direction of the rotor 107 by the centrifugal force, thereby forming the pump space 104.

  At the same time, the first path through which the air sucked from the suction port 131 provided in the thin plate 300 for forming the suction space flows into the pump space 104 from the suction port 113a through the groove 301 provided in the front plate 111. Then, the air flows into the pump space 104 from the second path, which flows into the pump space 104 from the suction port 113b provided in the end plate 112, through the through hole 105 provided in the cylinder 103 from the suction port 113a. That is, the first path is bent twice at 90 degrees from the suction port 113a, and the second path is bent twice at 90 degrees from there.

  FIG. 3 is a perspective view of the front plate as viewed from the non-motor side, in which the front plate 111 and the thin plate 300 are disassembled. A groove 301 communicating with the suction port 113a is dug in the front plate 111, and the thin plate 300 provided with the discharge port 115 and the suction port 131 is fastened from the opposite motor side by the fastening hole 302, and the suction path is formed in the front plate 111. Forming. As the rotor 107 rotates, the inflowing air causes the vane 109 to reciprocate in the slit 108 and the tip of the vane 109 slides along the inner wall of the cylinder 103, thereby causing the pump 104 to expand and contract. It is compressed in the space 104 and discharged from the discharge port 115 via the discharge port 114.

According to such a configuration, the sliding sound of the vane 109 leaking from the pump space 104 through the suction port 113a and the expansion sound due to the leakage of compressed air cause the suction path to bend 90 degrees at the inlet port 113a inlet to the front plate 111. By passing through the path leading to the suction port 131 through the groove 301 provided, the noise that leaks out of the pump from the suction port 131 can be suppressed because it is attenuated in the groove 301 without being opened directly to the outside of the pump, The pump can be operated silently.

  In short, it is desirable that the suction port 131a cannot be seen from the suction port 131. If the bending angle is configured to be about 60 to 120 degrees, it cannot be seen as described above, and the problem that the suction resistance increases does not occur. .

  Further, since the groove 301 which is a part of the suction path is formed in the front plate 111, it is not necessary to enlarge the pump external dimension.

(Embodiment 2)
FIG. 4 is an increase in the number of bends of the groove 301 compared to FIG. 3, and the number of points that attenuate the noise leaking from the suction port 113a increases, so that the noise leaking out of the pump from the suction port 131 is further suppressed. it can.

  In addition, a throttle portion 303 is provided in the groove 301. Accordingly, the suction air is diffused immediately after passing through the throttle portion 303 to reduce the frequency, and only the sliding sound of the vane 109 leaking from the pump space 104 through the suction port 113a and the expansion sound due to the leakage of the compressed air are used. In addition, the fluid noise of the intake air can be reduced.

  Further, the sound absorbing material 150 may be installed in a space delimited by the diaphragm 303. Thereby, the noise leaking from the suction port 113a can be absorbed, and the noise leaking from the suction port 131 to the outside of the pump can be suppressed. Further, the throttle portion 303 also serves as a stopper for the sound absorbing material 150, suppresses the movement of the sound absorbing material 150 to the suction port 113a during pump operation, and prevents pump lock due to the biting of the sound absorbing material 150 in the pump space 104.

  Further, if the number of bends is large, when the sound absorbing material 150 is installed in the groove 301, the wall surface 310 becomes a stopper even if there is no throttle portion 303, and the movement of the sound absorbing material 150 to the suction port 113a is suppressed during pump operation, Pump locking due to the sound absorbing material 150 being caught in the pump space 104 can be prevented.

(Embodiment 3)
FIG. 5 is a view in which a sheet-like sound absorbing material 150 is provided on the wall surface of the groove 301 in the section divided by the restrictor 303 shown in FIG. Thereby, the suction loss when the intake air passes through the sound absorbing material 150 is reduced, and it is possible to further suppress the noise leaking from the suction port to the outside of the pump while suppressing the decrease in the flow rate of the intake air. The sound absorbing material 150 may be provided over the entire wall surface in the suction path, or may be provided in combination with a sound absorbing material of a type that has air permeability and is filled.

  As described above, the vane rotary type air pump according to the present invention can reduce noise generated from the pump during operation without enlarging the dimensions, so that it can be used for household health appliances and medical treatment instruments. Applicable.

1 is a longitudinal sectional view showing a first embodiment of a vane rotary air pump according to the present invention. AA sectional view of the vane rotary type air pump of FIG. The perspective view which looked at the front plate which shows a 1st embodiment of the vane rotary type air pump concerning the present invention from the non-motor side The perspective view which looked at the front plate which shows 2nd Embodiment of the vane rotary type air pump concerning this invention from the non-motor side. The perspective view which looked at the front plate which shows 3rd Embodiment of the vane rotary type air pump concerning this invention from the non-motor side. Cross section of a conventional vane rotary pump

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Pump mechanism part 103 Cylinder 104 Pump space 105 Through-hole 107 Rotor 108 Vane slit 109 Vane 110 Mechanical shaft 111 Front plate 112 End plate 119 DC motor 150 Sound absorbing material 300 Thin plate 301 Groove 303 Restriction part 310 Wall surface

Claims (5)

A cylindrical rotor is disposed in a cylinder having a cylindrical inner wall with the center line of the cylindrical inner wall of the cylinder being eccentric from the central axis of the cylinder, and the rotor has a plurality of slits in the direction of the central axis. A plate-like vane made of a self-lubricating material is fitted in these slits in a slidable state, and a front plate and an end plate having a suction port are sandwiched between the rotor and the vane. Is arranged on the end face of the cylinder to form a pump space, a central shaft of the rotor is provided with a mechanical shaft to constitute a pump mechanism portion, and a motor is disposed on the non-mechanical side of the end plate. By driving the mechanical shaft, the rotor rotates, and the vane tip reciprocates in the slit, and the vane tip moves to the cylinder. An oilless air pump that slides along an inner wall to cause expansion and contraction of the pump space and repeats air suction, compression, and discharge, and has a suction path provided with one or more bends in the front plate A vane rotary type air pump formed. The vane rotary type air pump according to claim 1, wherein the bending angle of the suction path is 60 degrees to 120 degrees. The vane rotary type air pump according to claim 1 or 2, wherein the suction path is filled with a sound absorbing material. The vane rotary type air pump according to claim 1 or 2, wherein a sound absorbing material is provided on a wall surface of the suction path. The vane rotary type air pump according to any one of claims 1 to 4, wherein a throttle portion is provided in the suction path.

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