JPH07233786A - Miniature pump device - Google Patents

Abstract

PURPOSE:To obtain high compression efficiency and high totally closed pressure while the device is being made thin in thickness and small in size. CONSTITUTION:A drive shaft 3 is provided while being off-centered from the output shaft 2 of a motor 1. An operating rod 5 is provided, which is reciprocated in the direction of a motor diameter by the rotation of the drive shaft 3. A diaphragm body 7 is provided, which is equipped with an air chamber capable of acting a pumping operation while being compressed/expanded by the operating rod 5. Each drive section 7c is provided for the diaphragm body 7, which is connected to the operating rod 5, and allows the air chamber to be compressed/expanded by the reciprocal movement of the operating rod 5. This is the miniature pump device which enables only a surface faced to the output shaft 2 of the motor 1 to be displaced out of diaphragm sections 7a provided for the circumference of each drive section 7c. The difference in height is provided for each vertical surface height of the diaphragm sections 7a, and concurrently, a side length at the side of the low vertical height is made shorter than that at the side of the high vertical height.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact pump device used for pressurizing various pneumatic equipment such as a blood pressure monitor.

[0002]

2. Description of the Related Art Heretofore, the present applicant proposes that a pump device of this type should be miniaturized to increase the efficiency of the pump action and to make the pump device thin and compact. No. 255235 was filed first. This is configured as shown in FIGS. 5 and 6,
In the figure, 1 is a motor, 2 is an output shaft of the motor 1, 3 is an output shaft 2
Is a rod-shaped drive shaft 4 which is eccentrically attached by welding or the like, and is a lid-shaped motor mounting base for mounting the motor 1, and a penetrating portion for passing a mounting screw 20 of the motor 1 near the center thereof. Holes 4b are provided, and mounting holes 4 for screwing the motor mounting base 4 to other members are provided at the outer peripheral corners.
c are provided respectively. Further, an intake port 4a for introducing outside air into the pump device is provided at an appropriate location.

Reference numeral 5 is a substantially rod-shaped actuating rod, which is provided at its center with a coupling hole 5a for coupling with the drive shaft 3, and at both ends thereof, mounting holes 5b for mounting a diaphragm body 7 to be described later on the operating rod 5. Is provided. Reference numeral 6 denotes a rectangular box-shaped case having an opening on one side, four mounting holes 6c are provided at the outer corners, the opening surface is fitted to the motor mounting base 4, and the bottom surface of the box is a diaphragm body 7 to be described later. In addition to having an insertion hole 6a for inserting and holding the base 8 in the case 6, a ventilation port 6b for introducing the air introduced into the case 6 to an intake valve 7e described later is provided.

Reference numeral 7 denotes a diaphragm body formed of an elastic body such as rubber and having a rectangular shape with through holes 21 through which mounting screws are inserted at four corners. The diaphragm body 7 has an inclined surface and is substantially rectangular. The diaphragm portion 7a formed in a slanted column shape is three-dimensionally extended with respect to the plane of the diaphragm body 7 and is three-dimensionally and integrally opposed to each other on the outer circumference of the output shaft 2 by 180 degrees so that the sloped surface is the output shaft. Two bags are formed so as to be located on the center side, and a semicircular portion 7b serving as a bellows is provided on the upper surface of the diaphragm portion 7a with the same thickness as the diaphragm portion 7a over the entire circumference. Further, the diaphragm portion 7a
At the center of the diaphragm 7, a drive portion 7c for varying the volume in the diaphragm portion 7a to perform a pumping action is formed thickly to have an equal height from the bottom portion to the head portion of the diaphragm portion 7a in order to increase rigidity. . Further, a head portion 7d formed through a thin neck portion is provided at the tip of the driving portion 7c, and the head portion 7d penetrates through the mounting hole 5b of the operating rod 5 and is projected and attached to the rod surface. Is engaged with and held by the operating rod 5. Reference numeral 7e is a tongue-shaped suction valve integrally formed on the diaphragm body 7.

Reference numeral 8 is a rectangular plate-shaped base having mounting holes 22 at its four corners, and an air chamber 9 is formed in a volume surrounded by the base 8 and the internal space of the diaphragm portion 7a. As shown in FIG. 5, the air chamber 9 has an air chamber 9a on the outer side in the motor radial direction and an air chamber 9 on the inner side in the motor radial direction with respect to the drive portion 7c.
b, and the diaphragm portion 7a is formed with an inclined surface, the volume of the air chamber 9a is larger than that of the air chamber 9b.
Is larger than the volume of. On the side where the base 8 is in pressure contact with the diaphragm body 7, a substantially rectangular standing wall 10 having a shape substantially similar to the three-dimensional surface of the diaphragm portion 7a is provided.
The height of 0 is parallel to the short axis of the base 8, the standing wall 10a near the center is lower than the standing wall 10b on the far side, and the other two standing walls 10c parallel to the long axis of the base 8 are arranged. Is a sloped wall that connects the two walls. Further, a valve mounting hole 8a for mounting an exhaust valve 11 described later is provided on the surface of the base 8 in the standing wall 10, and a plurality of exhaust holes 8b are installed around the valve mounting hole 8a. , Further, intake valve 7
A groove-shaped suction passage 8c is provided for guiding the air passing through e to the air chamber 9.

In the assembled state of the diaphragm, the inner peripheral standing surface of the diaphragm portion 7a, which has a slant surface of the diaphragm body 7 and is formed into a substantially rectangular slanting column, has four sides, three of which are the standing wall 10b of the base 8 and the standing wall 10b. Since it is configured so as to be in close contact with the diaphragm 10c, the diaphragm portion 7 can be moved when the driving portion 7c moves.
Inward movement and deformation of a are prevented. Further, among the outer peripheral surfaces of the diaphragm portion 7a, the same three sides as described above are configured to come into close contact with the inner peripheral surface of the insertion hole 6a of the case 6, so that when the drive portion 7c moves, this diaphragm surface is outside. It is restricted to be displaced and expanded. Therefore, when the diaphragm portion 7a is driven by the operating rod 5, only the driving portion 7c surface having an inclined surface among the vertical surfaces of the diaphragm portion 7a can only vibrate, and the other surfaces can vibrate. It is sandwiched between and and is fixed without vibrating.

Reference numeral 11 denotes an umbrella-shaped exhaust valve made of an elastic material such as rubber, which is attached to the base 8 on the side opposite to the side in contact with the diaphragm body 7. Reference numeral 12 is a lid having mounting holes 23 at four corners of the outer edge, and an exhaust port 12a is provided in the center. Reference numeral 13 is a mounting screw for penetrating the motor mounting base 4, the case body 6, the diaphragm body 7, the base 8 and the lid body 12 and integrally fixing them.

In the small pump device configured as described above, when the motor 1 is energized and the output shaft 2 rotates,
The drive shaft 3 also rotates, which causes the operating rod 5 to move to the motor 1.
The diaphragm part 7 makes a circular motion in a plane perpendicular to the output shaft 2 of
The drive part 7c of a performs the same circular motion as the operating rod 5.
At this time, when viewed from the output shaft 2 side of the motor 1, the operating rod 5
In the process of increasing the distance from the tip of the drive rod (half round of circular movement), that is, when the tip of the operating rod 5 moves so as to be distant radially outward with respect to the output shaft 2, the drive portion 7c also moves in the radial direction. Since the volume of the air chamber 9 is displaced outward, and only the surface of the diaphragm having the inclined surface can be displaced, the air chamber 9a is compressed and its volume is reduced, while the air chamber 9b is expanded. The volume increases, but the air chamber 9
Since the volume of a is larger than the volume of the air chamber 9b,
The volume of the air chamber 9 is reduced as a whole. Next, the step of decreasing the distance between the tip of the operating rod 5 and the output shaft 2 of the motor 1 (the other half of the circular movement), that is, the operating rod 5 moves so as to approach the output shaft 2 inward in the radial direction. At this time, the drive portion 7c is also displaced inward in the radial direction, and the volume of the air chamber 9 increases as a whole.

In the process of decreasing the volume of the air chamber 9, the pressure in the air chamber 9 is increased and the intake valve 7e is pressed against the case body 6 to close it, while the exhaust valve 11 is opened and the exhaust port 12a is opened.
From which air is discharged. Next, in the step of increasing the volume of the air chamber 9, the air chamber 9 is decompressed, the exhaust valve 11 remains closed, the intake valve 7e opens, and the air that has entered the case body 6 through the intake port 4a is vented. 6b and the intake passage 8c to flow into the air chamber 9 for intake operation.

[0010]

However, in the conventional example as described above, in the compression process in which the tip of the working rod 5 during the pump operation is moved away from the output shaft 2 in the radial direction, The drive portion 7c is also displaced radially outward, and the volume of the air chamber 9 is configured to be displaceable only on the surface having the slope of the diaphragm. Therefore, the air chamber 9a is compressed and the volume is reduced, while the air chamber 9a is compressed. Although 9b is expanded and its volume increases, the volume of the air chamber 9a is larger than the volume of the air chamber 9b, so that the volume of the air chamber 9 is reduced as a whole, but the volume of the air chamber 9b is reduced. Since the volume difference between 9a and the air chamber 9b is formed only by the difference in the height of the slope, it is difficult to make it larger than a certain level. For this reason, there is a drawback that an air pump having high compression efficiency and higher total closing pressure cannot be obtained.

An object of the present invention is to solve the above problems and to provide a compact pump device which has a high compression efficiency and is capable of obtaining a high full closing pressure while achieving a reduction in thickness and size. Is.

[0012]

In order to achieve the above object, according to the invention of claim 1, a drive shaft 3 eccentrically attached to an output shaft 2 of a motor 1 and a rotation direction of the drive shaft 3 cause a radial direction of the motor. And a diaphragm body 7 having an air chamber 9 that is compressed / expanded by the operating rod 5 to perform a pumping action. The operating rod 5 is connected to the operating rod 5 and the operating rod 5 reciprocates. A drive unit 7c for compressing and expanding the air chamber 9 is provided in the diaphragm body 7,
In a small-sized pump device in which only the surface of the diaphragm portion 7a provided around the drive portion 7c facing the output shaft 2 of the motor 1 can be displaced, a height difference is provided in the height of the diaphragm portion 7a. It is characterized in that the side length on the side with the lower elevation is shorter than the side length on the side with the higher elevation.

According to the invention of claim 2, in claim 1,
The height difference of the elevation surface of the diaphragm portion 7a is low near the output shaft 2 of the motor 1 and high on the far side, and the side length is shorter on the near side than on the far side, and the diaphragm portion 7a is formed in a substantially trapezoidal prism shape. It is characterized by being formed.

[0014]

The diaphragm body 7 causes a volume change in the air chamber 9 according to the reciprocating movement of the actuating rod 5 which moves in the radial direction of the motor 1 when the motor 1 is driven, and performs a pumping action. The diaphragm portion 7a is provided with a slope due to the height difference of the standing wall, and the length of the side viewed from the plane of the lower side of the standing wall is shorter than the length of the side on the higher side of the standing wall. The step of compressing the chamber 9, that is, when the air chamber 9a is compressed and the air chamber 9b is expanded,
Since the volume of the air chamber 9a can be reduced more than the volume of the air chamber 9b can be increased, as a result, the volume reduction rate of the air chamber 9 is increased.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail below with reference to FIGS. In the figure, 1 is a motor, 2 is an output shaft of the motor 1, 3 is a round rod-shaped drive shaft that is eccentrically attached to the output shaft 2 by welding or the like, and 4 is a lid-shaped motor mount for mounting the motor 1. And the motor 1 near the center
Through holes 4b for inserting the mounting screws 20 are provided, and mounting holes 4c for screwing the motor mounting base 4 to other members are provided at the outer peripheral corners. Further, an intake port 4a for introducing outside air into the pump device is provided at an appropriate location.

Reference numeral 5 denotes a substantially rod-shaped actuating rod, which is provided with a coupling hole 5a for coupling with the drive shaft 3 at the center, and mounting holes 5b for mounting a diaphragm body 7 described later on the working rod 5 at both ends. Is provided. Reference numeral 6 denotes a rectangular box-shaped case having an opening on one side, four mounting holes 6c are provided at the outer corners, the opening surface is fitted to the motor mounting base 4, and the bottom surface of the box is a diaphragm body 7 to be described later. In addition to having an insertion hole 6a for inserting and holding the base 8 in the case 6, a ventilation port 6b for introducing the air introduced into the case 6 to an intake valve 7e described later is provided. The opening opening on the upper surface of the case 6 is a state in which a wide trapezoidal opening 6d having a trapezoidal shape in plan view provided at both ends is continuous with a narrow slit 6e narrower than the thick slit 6d. ing. The wide opening 6d formed in a trapezoidal shape in plan view is arranged such that the short side and the long side are substantially orthogonal to the longitudinal direction of the case 6, and the long side is the end of the case 6, respectively. The short sides are arranged to face each other. The width of the narrow width opening portion 6e in the lateral direction is thicker than the width of the actuating rod 5 in the lateral direction.

Numeral 7 is a diaphragm body formed of an elastic body such as rubber and having a rectangular shape with through holes 21 through which mounting screws are inserted at four corners. As shown in FIG. The diaphragm portion 7a is three-dimensionally extended with respect to the plane of the diaphragm body 7 and is three-dimensionally and integrally arranged 180 degrees relative to each other on the outer circumference of the output shaft 2 so that the slope is located on the output shaft center side. 2 bags are formed on the upper surface of the diaphragm portion 7a, and a semicircular portion 7b serving as a bellows is provided on the upper surface portion of the diaphragm portion 7a with substantially the same thickness as the diaphragm portion 7a. The diaphragm portion 7a has a slope as shown in FIG. 2, and of the two sides of the standing wall forming the slope, the length of the side a when viewed from the plane of the lower side of the standing wall is the height of the standing wall. It is formed in a substantially trapezoidal prism shape with a length shorter than the side B when viewed from the plane on the higher side. Further, in the central portion of the diaphragm portion 7a, a driving portion 7c for varying the volume inside the diaphragm portion 7a to perform a pumping action enhances the rigidity, so that the elevation height from the bottom portion to the head portion of the diaphragm portion 7a is increased. Are formed equally. In addition, a head portion 7d formed with a thin neck portion at the tip of the driving portion 7c.
Is provided and penetrates through the mounting hole 5b of the actuation rod 5 and projects and is attached to the rod surface, whereby the drive portion 7c is engaged with and held by the actuation rod 5. Reference numeral 7e is a tongue-shaped suction valve integrally formed on the diaphragm body 7, and is arranged 180 degrees relative to the central minor axis direction of the diaphragm body 7.

Reference numeral 8 denotes a rectangular plate-shaped base having mounting holes 22 at four corners, and as shown in FIG. 3, a diaphragm portion 7a.
An air chamber 9 is formed with a volume surrounded by the internal space of the base and the base 8. The air chamber 9 has an air chamber 9a on the outer side in the motor radial direction and an air chamber 9 on the inner side in the motor radial direction with respect to the drive unit 7c.
b, and the diaphragm portion 7a is formed with an inclined surface, the volume of the air chamber 9a is larger than that of the air chamber 9b.
Is larger than the volume of. A standing wall 10 having a shape substantially similar to the three-dimensional surface of the diaphragm portion 7a is provided on the side where the base 8 presses the diaphragm body 7, and the standing wall 10a near the center is lower than the standing wall 10b on the far side. ,
The other two standing walls 10c are sloped walls that connect the two walls. Here, the length of the standing wall 10a is the length of the standing wall 10b.
Is shorter than the length of the standing wall 10a and the standing wall 10b.
The standing wall 10c provided between and is curved or bent with the end portion on the side close to the standing wall 10a being inward. Further, a valve mounting hole 8a for mounting an exhaust valve 11 described later is provided on the surface of the base 8 in the standing wall 10, and a plurality of exhaust holes 8b are installed around the valve mounting hole 8a. Further, a groove-shaped suction passage 8c for guiding the air passing through the suction valve 7e to the air chamber 9 is provided.

In the assembled state of the diaphragm, the inner peripheral standing surface of the diaphragm portion 7a, which has the slant surface of the diaphragm body 7 and is formed in a substantially rectangular prism shape, has four sides, three of which are the standing wall 10b of the base 8 and the standing wall 10b. Since it is configured so as to be in close contact with the diaphragm 10c, the diaphragm portion 7 can be moved when the driving portion 7c moves.
Inward movement and deformation of a are prevented. Further, among the outer peripheral surfaces of the diaphragm portion 7a, the same three sides as described above are configured to come into close contact with the inner peripheral surface of the insertion hole 6a of the case 6, so that when the drive portion 7c moves, this diaphragm surface is outside. It is restricted to be displaced and expanded. Therefore, when the diaphragm portion 7a is driven by the operating rod 5, only the driving portion 7c surface having an inclined surface among the vertical surfaces of the diaphragm portion 7a can only vibrate, and the other surfaces can vibrate. It is sandwiched between and and is fixed without vibrating.

Reference numeral 11 denotes an umbrella-shaped exhaust valve made of an elastic body such as rubber, which is attached to the side of the base 8 opposite to the side in contact with the diaphragm body 7. Reference numeral 12 is a lid having mounting holes 23 at four corners of the outer edge, and an exhaust port 12a is provided in the center. Reference numeral 13 is a mounting screw for penetrating the motor mounting base 4, the case body 6, the diaphragm body 7, the base 8 and the lid body 12 and integrally fixing them.

Next, the operation of the compact pump device of the present invention will be described. When the motor 1 is energized and the output shaft 2 rotates, the drive shaft 3 also rotates, whereby the actuating rod 5 makes a circular motion in a plane perpendicular to the output shaft 2 of the motor 1 and the drive part 7c of the diaphragm part 7a becomes Performs the same circular motion as the actuating rod 5. At this time, as seen from the output shaft 2 of the motor 1, the step of increasing the distance from the tip of the operating rod 5 (half round of circular motion),
That is, when the distal end of the operating rod 5 moves so as to move away from the output shaft 2 in the radial direction, the drive unit 7c is also displaced in the radial direction in the same manner, and the volume of the air chamber 9 has the slope of the diaphragm. Since only the surface is configured to be displaceable, the air chamber 9a is compressed and its volume decreases, while
Although the air chamber 9b is expanded and its volume increases, the diaphragm portion 7a has a sloped surface, and of the two sides of the standing wall forming the sloped surface, the side a when viewed from the plane of the lower side of the standing wall Since the length of the air chamber 9a is shorter than the length of the side B when viewed from the plane on the side where the height of the standing wall is high, the air chamber 9a has a volume larger than that of the conventional example described above. Even if the amount of decrease does not change, the amount of increase in the volume of the air chamber 9b can be made small, and as a result, the amount of decrease in the volume of the air chamber 9 can be made large, and when the pump is operating, it is compressed as compared with the conventional example described above. High efficiency and higher total closing pressure can be obtained.

Next, the step of reducing the distance between the tip of the operating rod 5 and the output shaft 2 of the motor 1 (the remaining half of the circular motion), that is, the operating rod 5 approaches the output shaft 2 inward in the radial direction. Similarly, the drive portion 7c is also displaced inward in the radial direction when moving, and the volume of the air chamber 9 as a whole increases. In the process of decreasing the volume of the air chamber 9, the pressure of the air chamber 9 is increased and the intake valve 7e is pressed against the case body 6 to be closed, while the exhaust valve 11 is opened and the exhaust port 12a is opened.
From which air is discharged. Next, in the step of increasing the volume of the air chamber 9, the air chamber 9 is decompressed and the intake valve 7e is opened while the exhaust valve 11 is closed, and the air that has entered the case body 6 through the intake port 4a. Is a vent hole 6b and an intake passage 8c
Then, the air flows into the air chamber 9 and the intake operation is performed. Since the air chambers 9 are installed 180 degrees apart from each other so that they face each other, the suction and compression processes of the two chambers are just opposite, and when one air chamber 9 is sucking air, the other air chamber is blown. The chamber 9 is operating to compress the air. Further, each air chamber 9 performs one pumping action by one rotation of the drive shaft 3, but is performed twice as a whole, and
Since the phase of the discharged air differs by 180 degrees depending on the air chamber 9, the pulsation of the air discharged from the exhaust port 12a is reduced as compared with a pump having one air chamber 9.

Next, a second embodiment of the present invention is shown in FIG. This is different from the first embodiment mainly in the diaphragm body 7.
Although the three-dimensional shape of the base 8 is the same, but the mounting direction with respect to the plane is different, the motor 1, the output shaft 2, the drive shaft 3, the motor mounting base 4, which are members having the same basic functions, The exhaust valve 11 and the lid 12 are designated by the same reference numerals, and detailed description thereof will be omitted.

Numeral 5 is a substantially rod-shaped actuating rod, which is provided with a coupling hole 5a for coupling with the drive shaft 3 at the center, and mounting holes 5b for mounting a diaphragm body 7 described later on the working rod 5 at both ends. Is provided. The rectangular mounting holes 5b are provided at both ends so that the longitudinal direction is parallel to the longitudinal direction of the operating rod 5. 6 is a rectangular box-shaped case with one surface open, and four mounting holes 6 at the outer corner.
c is provided, the opening surface is fitted with the motor mounting base 4, and the box bottom surface has an insertion hole 6a for inserting and holding a diaphragm body 7 and a base 8 described later in the case 6, and An intake valve 7 which will be described later with the air introduced into the inside 6
A ventilation port 6b for leading to e is installed. Case 6
The opening opening on the upper surface of the is a state in which a wide opening 6d having a trapezoidal shape in plan view provided at both ends is continuous with a narrow opening 6e narrower than the wide opening 6d. . The wide openings 6d formed in a trapezoidal shape in plan view are arranged such that the short side and the long side are substantially parallel to the longitudinal direction of the case 6, and are arranged in opposite directions. .
The width of the narrow width opening 6e in the lateral direction is equal to that of the operating rod 5 described above.
It is thicker than the width in the lateral direction.

Reference numeral 7 denotes a diaphragm body formed of an elastic body such as rubber into a rectangular shape. A diaphragm portion 7a having a slanting surface and having a substantially trapezoidal prism shape is formed on the diaphragm body 7 on the plane of the diaphragm body 7. In contrast, three bags are three-dimensionally stretched and two bags are formed so that the slopes are three-dimensionally and integrally face the long sides of the diaphragm body 7 so as to face different long sides. That is, the three-dimensional shape of the diaphragm portion 7a is the same as that of the first embodiment, but the diaphragm portions 7a are rotated by 90 degrees so that the directions of the respective diaphragm portions 7a are opposite to those of the first embodiment. Has become.

Reference numeral 8 is a rectangular plate-shaped base having mounting holes 22 at its four corners. The three-dimensional shape of the standing wall 10 is the same as that of the first embodiment, but depending on the arrangement of the diaphragm portion 7a in this embodiment. The slopes of the upright walls 10 are provided so as to face the long sides of the base 8 and face each other. The other parts are the same as in the first embodiment. When the actuating rod 5 makes a circular motion in the above structure, the driving part 7c of the diaphragm part 7a also makes a circular motion to change the volume of the air chamber 9, but the diaphragm part 7a is 90 degrees as compared with the first embodiment. Since they are arranged so as to be rotated, the operation axis in the compression and intake action steps of the diaphragm is displaced by 90 degrees to perform the pump operation. Also in this case, similarly to the above-described first embodiment, the step of increasing the distance from the tip of the operating rod 5 as viewed from the output shaft 2 of the motor 1 (half round of circular motion), that is, the tip of the operating rod 5 is When it is moved so as to be distant from the output shaft 2 in the radial direction, the drive portion 7c is also displaced in the radial direction in the same manner, and the volume of the air chamber 9 is configured to be displaceable only in the surface having the slope of the diaphragm. Therefore, the air chamber 9a is compressed and its volume is reduced, while the air chamber 9b is compressed.
Is expanded and the volume increases, but the diaphragm portion 7
a has a slope, and of the two sides of the standing wall forming the slope,
Since the length of the side a viewed from the plane where the height of the standing wall is low is shorter than the length of the side b when viewed from the plane where the height of the standing wall is high, it is formed into a substantially trapezoidal prism. Compared with the above-mentioned conventional example, the increase amount of the volume of the air chamber 9b can be reduced even if the volume reduction amount of the air chamber 9a does not change, and as a result, the decrease of the volume of the air chamber 9 can be increased. When the pump is operating, the compression efficiency is higher than that of the conventional example described above, and a higher total closing pressure can be obtained.

[0027]

According to the present invention, the drive shaft eccentrically attached to the output shaft of the motor, the operating rod that reciprocates in the radial direction of the motor due to the rotation of the drive shaft, and the compression rod
It is composed of a diaphragm body having an air chamber that is inflated to perform a pumping action.The diaphragm body is provided with a drive unit that is connected to the operating rod and that compresses and expands the air chamber by the reciprocating motion of the operating rod. In a small pump device in which only the surface of the surrounding diaphragm part facing the motor output shaft can be displaced, a height difference is provided in the height of the diaphragm part and the side of the lower height Since the length is shorter than the side length on the higher elevation side, it is possible to increase the reduction rate of the volume of the air chamber compared to the pump device shown in the conventional example, and to reduce the thickness. In addition, it is possible to obtain an air pump having high compression efficiency and high total closing pressure while achieving miniaturization.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 shows a diaphragm body used in the same as above, (a) is a plan view, (b) is AA in (a).
A line sectional view, (c) is a bottom view.

FIG. 3 is a cross-sectional view showing the overall configuration of the above.

FIG. 4 is an exploded perspective view showing a second embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional example.

FIG. 6 is an exploded perspective view of a conventional example.

[Explanation of symbols]

 1 Motor 2 Output Shaft 3 Drive Shaft 5 Actuating Rod 7 Diaphragm Body 7a Diaphragm Section 7c Drive Section 9 Air Chamber

Claims (2)

[Claims] 1. A drive shaft eccentrically attached to an output shaft of a motor, an operating rod that reciprocates in the radial direction of the motor by rotation of the drive shaft, and an air chamber that is compressed / expanded by the operating rod to perform a pumping action. And a diaphragm unit provided with a drive unit that is connected to the operation rod and that compresses and expands the air chamber by the reciprocating motion of the operation rod is provided in the diaphragm unit, and among the diaphragm units provided around the drive unit. In a small pump device that can displace only the surface facing the output shaft of the motor, a height difference is provided in the height of the diaphragm and the side length on the side with the lower height is higher. A small pump device characterized by being shorter than the side length on the side. 2. The elevation difference of the elevation of the diaphragm portion is such that the side near the output shaft of the motor is low and the side near the output side is high, and the side length is shorter near the side than the far side. The small-sized pump device according to claim 1, wherein the small-sized pump device is formed.