KR20090009096A - Miniature pump - Google Patents

Abstract

Pump output of multiple systems is obtained from one motor drive system, which enables space saving and cost reduction of a small pump.

Through-holes 29A and 29B are provided in the bottom of the diaphragm 24A and 24B, and the shaft body 27 having the air introduction hole 27a communicating with the through-holes 29A and 29B is provided in the oscillator 26. It protrudes and installs the hollow attachment bodies 25A and 25B which protruded in the back surface of the diaphragm 24A and 24B to this shaft body 27, and attaches the intake valve body 28 to the through-holes 29A and 29B. The output valve body 38A, 38B is provided in the output hole 36A, 36B which communicates with pump chamber 23A, 23B, and the diaphragm is fluctuated by the oscillation of the oscillation body 26 which drive | operates the motor 6. As shown in FIG. 24A and 24B move up and down to perform a pump operation. The pump chambers 23A, 23B are divided into a plurality of output systems, each having an output hole 36A, 36B for each output system, and obtains a plurality of pump outputs from one motor drive system.

Description

Small Pump {SMALL PUMP}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small pump, and more particularly, to a small pump used in a fuel cell system or the like and further using a diaphragm.

A conventional small pump of this kind will be described with reference to FIG. The small pump 21 is provided with two diaphragms 24 and 24 which form the pump chambers 23 and 23 in the cylindrical case 22, and has a hollow attachment body at the lower center of the diaphragms 24 and 24. As shown in FIG. 25 and 25 protrude downward, and below this diaphragm 24 and 24, the oscillation body 26 which moves up and down the lower surface of these diaphragms 24 and 24 is arrange | positioned. In addition, the case 22 is composed of three stages: an upper case 22a, a middle case 22b, and a lower case 22c, and the diaphragms 24 and 24 are formed of the diaphragms 24 and 24. Protrusions 24a and 24a are squeezed between the upper case 22a and the middle case 22b and are held in the case 22.

The shafts 27 and 27 located near the periphery of the oscillator 26 and located below the center of each of the diaphragms 24 and 24 and having the air introduction holes 27a and 27a protrude upwards. And the inner surfaces of the hollow attachment bodies 25 and 25 of the diaphragms 24 and 24 are tightly fitted to the outer surfaces of the shafts 27 and 27 so that the diaphragm 24 and the oscillator 26 are fitted. 24) is attached.

In addition, a part of the bottom center portion of the diaphragms 24 and 24 is cut off, and the intake valve bodies 28 and 28 are formed, and through holes 29 and 29 are provided by this cutting. The intake valve parts 28 and 28 allow the through holes 29 and 29 to be closed and open, and the intake valve parts V1 and V1 are formed.

In addition, an eccentric rotation shaft 30 which oscillates the oscillator 26 by eccentric rotation is penetrated and fixed to the center of the oscillator 26. And the extension part 31 is installed in the upper part of the oscillation body 26 from the said case 22b, and the recessed part 32 is formed in the lower part of this extension part 31, On the other hand, the rotating body 34 is fixed to the upper end of the rotary drive shaft 33 disposed on the lower side of the lower case (22c). Moreover, the recessed part 35 is formed in the position away from the center position of the upper part of this rotating body 34, The lower end part of the said eccentric rotation shaft 30 is loosely fitted in this recessed part 35, and this eccentric rotation shaft 30 ) Is fitted loosely into the recess 32 of the extension mounting portion 31.

In addition, an exhaust hole (output hole) 36 is drilled through the central portion of the upper case 22a, and communicates with the exhaust hole 36 on the outer circumference of the exhaust hole 36 of the lower surface of the upper case 22a. Two annular concave grooves 37 and 37 are provided, and an exhaust valve body (output valve) comprising upper ends of the diaphragms 24 and 24 on inner wall surfaces 37a and 37a of the annular concave grooves 37 and 37. The exhaust valve portions V2 and V2 are configured by bringing the sieves 38 and 38 into pressure contact.

The motor 39 is connected to the rotary drive shaft 33, the motor 39 is stored in the motor case 40, and the lower case 40 is mounted on the upper plate 40a of the motor case 40. Stack 22c) and connect the two. In addition, a communication hole 41 communicating with the inside of the motor case 40 is provided in the bottom plate 22d of the lower case 22c and the upper plate 40a of the motor case 40. Intake holes 42 and 42 for introducing outside air into the motor case 40 are formed in the lower part of the motor case 40.

Then, when the rotary body 34 rotates by the rotation of the rotary drive shaft 33, the eccentric rotation shaft 30 is eccentrically rotated, thereby causing the oscillator 26 to oscillate, the diaphragm 24 , 24) moves the lower end of the up and down. When the lower end of one diaphragm 24 is lowered, the inside of the diaphragm 24 becomes negative pressure, and the exhaust valve body 38 comes into close contact with the inner wall surface 37a of the annular concave groove 37. The exhaust valve portion V2 is closed, and the intake valve body 28 opens the through hole 29 from the closed state, and the intake valve portion V1 is opened, and the air inlet hole 27a ) Is taken into the diaphragm 24 as shown by arrow C. FIG.

Next, when the lower end of the diaphragm 24 is homologous, the inside of the diaphragm 24 becomes high pressure, and the intake valve body 28 closes the through hole 29 to close the intake valve portion V1. In addition to being in a closed state, the exhaust valve body 38 expands and falls from the inner wall surface 37a, and the output by the exhaust valve unit V2 is performed as shown by the arrow D. FIG. Air discharged from the exhaust valve body 38 passes through the annular recess 37 and is discharged from the exhaust hole 36 to the outside of the case 22 to obtain a pump output.

In addition, the lower case 22c inside the lower case 22c becomes negative pressure in accordance with the homology of the diaphragm 24, and the air in the motor case 40 flows in as shown by the arrow E through the communication hole 41. As a result, the inside of the motor case 40 becomes negative pressure, and outside air is sucked in through the intake hole 42 as shown by the arrow F, and the pump operation of the small pump 21 is performed (see Patent Document 1).

Patent Document 1: Japanese Patent Application Laid-Open No. 2002-106471

However, the small pump described in Patent Document 1 includes a diaphragm for forming a plurality of pump chambers in a casing. Since a plurality of pump chambers have one output hole (exhaust hole) in common, one system (one type) Only the pump output of can be obtained.

Therefore, when a plurality of types of pump outputs are required or when a plurality of pumps of the same type are required, it is necessary to provide a plurality of small pumps accordingly, and the installation area of the small pumps increases. In addition, when a plurality of small pumps are provided, running costs such as equipment cost and power cost increase accordingly.

Moreover, since the said compact pump fits a hollow attachment body by the pressure contact with the outer side of a shaft body, in order to make both fitting parts high, it is necessary to form this hollow attachment body and a shaft body long, and The height is that big. In addition, there is a defect that the hollow adherent body gradually comes out of the shaft body by the rocking action of the rocking body.

Thus, the present applicant has proposed a novel small pump shown in Figs. 7 to 9 in order to eliminate the deficiencies of the example of the above-described example (unpublished technology of the application filed on March 5, 2007). In addition, about the part which is common in the conventional example shown in FIG. 6, the same code | symbol is attached and demonstrated. In the figure, the small pump 1 comprises an upper pump case 3 which forms a top plate as the pump case 2, and a lower pump case 4 which is integrally connected to the circumferential lower surface of the upper pump case 3; The lower part of the lower pump case 4 has the motor case 5 integrally fitted to the side wall 5a of the motor case 5, and in the case K of the small pump 1, Four diaphragms 24A, 24B, 24C and 24D, the oscillator 26 and the motor 6 are housed.

Air into the pump chambers 23A, 23B, 23C, and 23D is defined as a space between the upper pump case 3 and each of the diaphragms 24A, 24B, 24C, and 24D as the pump chambers 23A, 23B, 23C, and 23D. Suction and discharge. In addition, the four pump chambers 23A, 23B, 23C, and 23D have one output hole (exhaust hole) 36 in common as shown in Figs. Moreover, the output valve body (exhaust valve body) 38 is provided in each diaphragm 24A, 24B, 24C, 24D upper pump case 3 side, respectively.

Through-holes 29 are drilled in the center of the bottom portion of each diaphragm 24A, 24B, 24C, and 24D, and an intake valve body 28 for opening and closing the through-hole 29 is provided, and an intake valve portion V1 is provided. ) Is configured. On the other hand, a shaft body 27 having an air introduction hole 27a communicating with the through hole 29 is protruded in the vicinity of the periphery of the oscillator 26. On the other hand, the hollow attachment body 25 protrudes from the bottom surface of each diaphragm 24A, 24B, 24C, and 24D, and this hollow attachment body 25 is tightly attached to the outer surface of the said shaft body 27. The diaphragms 24A, 24B, 24C, and 24D are attached to the oscillator 26.

In addition, the upper end of the eccentric rotation shaft 30 is fixed to the center of the oscillator 26, and the lower end of the eccentric rotation shaft 30 is the upper surface of the pulley (rotator) 10 of the motor portion M, and the motor shaft It is loosely fitted in the position eccentric from the center of 6b. Accordingly, the diaphragm 24A, 24B, 24C, 24D moves up and down by the eccentric rotation shaft 30 being eccentrically rotated and the oscillating body 26 swings up and down by the drive of the motor 6, so that the pump chamber 23A , 23B, 23C, 23D) are compressed and expanded to obtain a pump output.

In particular, the shaft 27 is provided with a recess 27b for preventing the diaphragm 24A, 24B, 24C, and 24D from falling out, and the projection 25a is provided in the hollow attachment body 25. In addition, the pulley 10 is directly fixed on the back yoke portion 6c to which the rotor magnet 6a is fixed and the motor shaft 7. Reference numeral 9 denotes a stator, and reference numeral 11 denotes a circuit board.

However, even in this small motor, since a plurality of pump chambers have one output hole in common, only one system of pump output can be obtained. Therefore, when a plurality of types of pump outputs are required or when a plurality of one types of pump outputs are required, it is necessary to provide a plurality of small pumps accordingly. As a result, while the installation area of a small pump increases, running costs, such as an installation cost, also increase. As described above, the small pump also has room for improvement in terms of space saving and power saving.

Therefore, since the technical problem to be solved arises in order to obtain the pump output of multiple systems from one motor drive system, and to enable space saving and cost reduction of a small pump, this invention aims at solving this problem. .

The present invention has been proposed in order to achieve the above object, and the invention described in claim 1 includes a plurality of diaphragms for forming a pump chamber in a case, and a through hole is provided at the bottom of the diaphragm, and in this through hole. A shaft body having an air inlet hole communicating therewith is provided on the oscillator, and a hollow attachment body protruding from the bottom surface of the diaphragm is attached to the shaft body to connect the diaphragm to the oscillator. In a small pump in which an intake valve body is provided in a hole, an output valve body is provided in an output hole communicating with the pump chamber, and the diaphragm moves up and down by pumping the swinging body caused by driving of the motor. The pump chamber is divided into a plurality of output systems and an output hole is provided for each output system. A compact pump is provided, which is configured to obtain a plurality of pump outputs from one motor drive system.

According to this configuration, when the oscillator is oscillated by the drive of the motor, the plurality of diaphragms move up and down, so that the inside of the pump chamber is compressed and expanded to perform the pump operation. In this case, since this pump chamber is provided with a common output hole for each of a plurality of output systems, a plurality of pump outputs are simultaneously obtained by one motor drive system.

The invention according to claim 2 provides the compact pump according to claim 1, wherein the pump chamber has a different pump capacity for each output system.

According to this configuration, since the pump capacity is different for each of a plurality of different output systems, a plurality of pump outputs having different pump capacities are obtained from one motor drive system.

The invention according to claim 3 provides the compact pump according to claim 1, wherein the pump chamber has the same pump capacity for each output system.

According to this configuration, since the pump capacity is the same for each different output system, a plurality of pump outputs having the same pump capacity are obtained from one motor drive system.

In the invention according to claim 1, since a plurality of pump outputs are obtained by one motor drive system, when a plurality of pump outputs is required, a plurality of small pumps need to be provided in the prior art, but in the present invention, one small pump Since the pump can be used, it is possible to reduce the installation area of the small pump as compared with the conventional one, and to significantly reduce the running cost such as equipment cost and power cost.

In the invention according to claim 2, since a plurality of pump outputs having different pump capacities are obtained from one motor drive system, in addition to the effect of the invention according to claim 1, when a plurality of pump outputs having different pump capacities are required, In the prior art, a plurality of small pumps were required, but in the present invention, one small pump can be used.

In the invention according to claim 3, since a plurality of pump outputs having the same pump capacity are obtained from one motor drive system, in addition to the effect of the invention according to claim 1, in the prior art, a plurality of small pumps are required. It can cope with one small pump.

(The best mode for carrying out the invention)

The present invention is provided with a plurality of diaphragms for forming a pump chamber in the case, in order to achieve the object of obtaining a pump output of a plurality of systems from a single motor drive system to enable space saving and cost reduction of the small pump, A through-hole is provided in the bottom of the diaphragm, and a shaft body having an air inlet hole communicating with the through-hole is projected to the oscillator, and the hollow attachment body protruding from the bottom of the bottom of the diaphragm is attached to the shaft. The diaphragm is connected to the oscillator, and an intake valve body is provided in the through hole, an output valve body is installed in an output hole communicating with the pump chamber, and the oscillator is driven by the motor. In the small pump in which the diaphragm moves up and down by pumping, the pump operation is performed. This is achieved by being divided into an output system and having one output hole in common for each output system, so that a plurality of pump outputs can be obtained from one motor drive system.

(Example)

Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5. The small pump according to this embodiment is provided with two pump chambers of two output systems, and an output valve body (exhaust valve body) is provided in output holes (exhaust holes) formed in the pump chambers of each output system, respectively. It is characterized in that it is comprised so that two systems of pump outputs may be obtained from each output hole.

In the example of illustration, since one pump room and the other pump room among two output systems differ in magnitude of a pump capacity, two types of pump outputs with different pump capacities are simultaneously obtained from one motor drive system.

In the present invention, a plurality of arbitrary pump outputs can be obtained by changing the method of dividing a plurality of pump chambers or the size of each pump chamber. Since this can be realized by one drive system (motor), it is not necessary to use a plurality of drive systems, thereby enabling power saving and eliminating the need to provide a plurality of small pumps.

1 is a perspective view of a small pump of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a sectional view taken along the line A-A of FIG. 2, FIG. 4 is a sectional view taken along the line B-B of FIG. 2, and FIG. In addition, the part which is common to the small pump shown in FIG. 6 is attached | subjected with the same code | symbol for the convenience of description. In the figure, the small pump 1 comprises an upper pump case 3 which forms a top plate as the pump case 2, and a lower pump case 4 which is integrally connected to the circumferential lower surface of the upper pump case 3; And this motor case 5 in which the lower part of the lower pump case 4 is integrally fitted to the side wall 5a of the motor case 5.

In the case K of the small pump 1, a plurality of, for example, four diaphragms 24A, 24A, 24B, 24B, the oscillator 26, and the motor 6 are housed. Moreover, the output valve body 38A or 38B is provided in the upper-pump case 3 side of each diaphragm 24A, 24A or 24B, 24B, and the oscillation body of each diaphragm 24A, 24A, 24B, 24B ( An intake valve body 28A or 28B is provided on the swinging piston 26 side.

In the space part between the upper pump case 3 and each diaphragm 24A, 24A, 24B, 24B, the pump chamber 23A, 23A, 23B, 23B which takes in and discharges air is provided, respectively. The two pump chambers 23A and 23A and the two pump chambers 23B and 23B are divided into different output systems. In addition, the pump chambers 23A, 23A of one output system and the pump chambers 23B, 23B of the other output system have different capacities, and the capacity of the pump chambers 23A, 23A is the capacity of the pump chambers 23B, 23B. It is formed smaller than.

One output hole 36A is provided in common in the two pump chambers 23A and 23A, and one output hole 36B is provided in common in the two pump chambers 23B and 23B. For this reason, it is comprised so that the pump output of two systems may be acquired simultaneously using one motor 6 as a drive source.

In this embodiment, an on-off valve (not shown) is provided downstream from the output valve bodies 38A, 36B of the output holes 36A, 36B, respectively, and the on-off valves and output holes on the output hole 36A side are respectively provided. The opening / closing valve on the 36B side is configured to be opened and closed independently of each other by a control unit (not shown).

In the small motor 1 of the present invention, the swinging body 26 is driven by the driving of the motor 6, and the pump chambers 23A, 23A and the pump chamber 23B, By alternately compressing and expanding 23B), two types of pump outputs are obtained.

For example, when the pump chamber 23A is shaken to the upper pump case 3 side by the swinging of the swinging body 26, the pump chamber 23A is compressed. At this time, the output valve body 38A is opened, and the compressed air (fluid) in the pump chamber 23A is discharged from the output hole 36A, whereby a pump output of a kind corresponding to the capacity or compression ratio of the pump chamber 23A is produced. Obtained.

On the contrary, when the pump chamber 23A is shaken toward the motor 6 side, the pump chamber 23A expands. At this time, the intake valve body 28A is opened, and air is sucked in through the air introduction hole 27a in the pump chamber 23A. The same applies to the output of the pump chamber 23B.

By repeating this series of operations, two types of pump outputs are obtained according to the capacity or compression ratio of each of the pump chambers 23A, 23A, 23B, 23B of the two output systems, and the obtained pump output is, for example, a fuel electronic system. (Not shown).

In Fig. 4, through holes 29A are drilled in the bottoms of the diaphragms 24A and 24A, and an intake valve body 28A for opening and closing the through holes 29A is provided, and the intake valve portion V1 is provided. ) Is configured. In addition, in FIG. 5, each diaphragm 24B, 24B is comprised similarly to the above. In addition, the intake valve body 28A or 28B is provided by cutting a part of the diaphragm 24A, 24A or 24B, 24B.

The shaft 27 which has the air introduction hole 27a protrudes in four places of the periphery of the said oscillation body 26, respectively, and this air introduction hole 27a is connected to the said through hole 29A, 29B. Through. On the other hand, cylindrical hollow attachment bodies 25A and 25B protrude from the bottom surface of each diaphragm 24A, 24A and 24B and 24B, respectively, and the hollow attachment bodies 25A and 25B are mounted on the shaft body. (27) The diaphragm 24A, 24A, 24B, 24B is attached to the outer surface 26 tightly to the outer side surface.

The upper end of the eccentric rotation shaft 30 is fixed to the center of the oscillator 26, and the lower end of the eccentric rotation shaft 30 is the upper surface of the pulley (rotary body) 10 of the motor portion M. It is loosely fitted in the position eccentric from the center of 6b. Therefore, the eccentric rotation shaft 30 eccentrically rotates and the oscillator 26 swings up and down by the drive of the motor 6, so that the diaphragms 24A, 24A, 24B, 24B move up and down, and the pump chamber 23A, 23A. , 23B, 23B) are compressed and expanded to obtain a pump output.

In the example of illustration, since the pump part P and the motor part M are provided in the same space part A in the case K, the upper and lower dimensions for connecting the pump part P and the motor part M are not. The long connecting member becomes unnecessary, and the extra space required for the configuration is also unnecessary.

In particular, the above-described shaft bodies 27 are provided with recesses 27b for preventing release of the diaphragms 24A, 24A, 24B, and 24B. In addition, the hollow attachment bodies 25A and 25B have small vertical dimensions, and the protrusions 125 are provided on the hollow attachment bodies 25A and 25B, respectively.

In this way, since each projection part 125 was fitted to the said fall prevention recessed part 27b, and the diaphragm 24A, 24A, 24B, 24B was attached to the oscillation body 26, both are firmly fitted and the oscillation body When the diaphragms 24A, 24A, 24B, and 24B move up and down by the swinging action of 26, the hollow attachment bodies 25A and 25B do not come off from the shaft 27.

Moreover, the pulley 10 fixed directly on the motor shaft 7 is integrally provided in the upper surface of the said rotor magnet 6a. Then, the lower end of the eccentric rotation shaft 30 is loosely fitted into the recess 10a near the center of the pulley 10, and the oscillator 26 swings due to the eccentric rotation of the eccentric rotation shaft 30. The action is configured to be executed. In FIG. 3, reference numeral 9 denotes a stator of the coil 6 in which the coil is wound, and reference numeral 11 denotes a circuit board on which electronic components are mounted.

The shaft hole portion 45 is drilled in the vertical direction in the projection portion 51 provided at the center of the bottom surface of the motor case 5, and the shaft shaft portion 45 is freely movable in the shaft through the bearing 12. It is also fitted to rotate freely. Moreover, the lower end part of this motor shaft 6b is supported by the adjusting screw 47 through the washer 49, and this adjusting screw 47 is formed in communication with the lower end of the shaft hole part 45, and is formed. Is screwing in.

Therefore, when the height position of the motor shaft 6b is changed by the rotation operation of the adjustment screw 47, the height position of the swinging body 26 connected to the pulley 10 changes. As a result, since the compression ratio of each pump room 23A, 23A, 23B, 23B also changes, pump output is adjusted and changed.

As described above, according to the present embodiment, the pump chambers 23A and 23A of one output system and the pump chambers 23B and 23B of the other output system have separate output holes 36A and output holes 36B, respectively. Since it is independent from each other, pump outputs of different types can be obtained from the output hole 36A and the output hole 36B.

In the illustrated example, since the capacity of the pump chambers 23A and 23A is smaller than that of the pump chambers 23B and 23B, the capacity of the pump output obtained from the output hole 36A is smaller than the capacity of the pump output obtained from the output hole 36B. .

In the small pump 1 according to the present embodiment, two types of pump outputs of different types are simultaneously obtained from one motor drive system. Therefore, when two types of pump outputs of different types are required, two small pumps are required in the prior art, but in the present invention, only one small pump can be used, so that the space for installing the small pump can be reduced. In addition, the running cost such as equipment cost and power cost of the small pump is also greatly reduced.

The on / off valves of the two output systems, that is, the on / off valves on the output hole 36A side and the on / off valves on the output hole 36B side can be opened and closed independently of each other. Therefore, in order to suit the capacity or compression ratio of the pump chambers 23A, 23A, 23B, 23B of each output system, by setting the opening / closing time, opening / closing pressure, etc. of the opening / closing valve of each output system, the pump output of each output system can be seen more. It can be obtained efficiently.

In addition, in the example of illustration, although the capacity | capacitance of pump chamber 23A, 23A was set smaller than the capacity | capacitance of pump chamber 23B, 23B, the capacity | capacitance of pump chamber 23A, 23A and the capacity | capacitance of pump chamber 23B, 23B are the same size mutually. Can be set. According to this configuration, in the output hole 36A and the output hole 36B forming two output systems, one type of pump output having pump capacity equivalent to each other is obtained independently of each other. Therefore, one type of pump output can be used simultaneously in two places.

In the above embodiment, although air is used as the compression medium of the compression pump, it is also possible to use a fluid such as gas or liquid other than air. The small pump of the present invention can also be used in either longitudinal or transverse arrangements. In addition, the present invention is also applicable to a small pump (see Fig. 6) of a type in which the rotor is installed separately from the motor.

Further, the present invention can be variously modified without departing from the spirit of the present invention, and it is natural that the present invention affects this modified product.

Figure 1 shows an embodiment of the present invention, a perspective view of a small pump.

2 is a plan view of the small pump of FIG.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a cross-sectional view taken along the line B-B in FIG.

5 is a cross-sectional view taken along the line C-C in FIG.

6 is a longitudinal sectional view of a conventional small pump.

Figure 7 is a perspective view of an unpublished small pump that the applicant filed earlier.

8 is a plan view of the small pump of FIG.

9 is a cross-sectional view taken along the line A-A of FIG.

(Explanation of the sign)

1 small pump 2 pump case

3 upper pump case 4 lower pump case

5 motor casing 6 motor

6b Motor Shaft 10 Pulleys (Rotator)

23A Pump Room 23B Pump Room

24A Diaphragm 24B Diaphragm

25A Hollow Shape Attachment 25B Hollow Shape Attachment

26 Oscillator (Swing Piston) 27 Shaft

27a Air introduction hole 27b Recess prevention

28 Intake valve body 36A Output hole (Exhaust hole)

36B Output hole (Exhaust hole) 38A Output valve body (Exhaust valve body)

38B output valve body (exhaust valve body) 45 shaft bore

47 Adjustment screw (height adjustment means) 48 Screw hole

49 Washer M Motor

Claims (3)

A plurality of diaphragms which form a pump chamber in a case are provided, A through-hole is provided in the bottom part of this diaphragm, The shaft body which has an air introduction hole communicated with this through-hole is protruded in the oscillator, and this diaphragm is provided in this shaft body. The diaphragm is connected to the oscillator and the intake valve body is provided in the through hole, and an output valve is connected to the output hole communicating with the pump chamber. A small pump in which a sieve is provided and the diaphragm moves up and down by pumping the swinging body accompanied by driving of a motor, thereby performing a pump operation. The pump chamber is divided into a plurality of output systems, and each output system is provided with one output hole, and a small pump, characterized in that configured to obtain a plurality of pump outputs from one motor drive system. The small pump according to claim 1, wherein the pump chamber has a different pump capacity for each output system. The small pump according to claim 1, wherein the pump chamber has the same pump capacity for each output system.

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