JPH07269467A - Small pump unit - Google Patents

Abstract

PURPOSE:To secure a small pump unit that is high in total-close pressure without reducing the displacement of an operating rod. CONSTITUTION:This small pump unit is equipped with a driving shaft 3 eccentrically attached to an output shaft, an operating rod 5 reciprocating in the radial direction of a motor by rotation of this driving shaft 3, and a diaphragm body 7 provided with an air chamber 9 doing its pumping action after being compressed or expanded, respectively. In this constitution, a driving part 7c compressing or expanding the air chamber 9 by reciprocating motion of the operating rod 5 is installed in the diaphragm body 7. In addition, this small pump unit is featured in that only a surface standing opposite to the output shaft 2 is made displaceable, out of two diaphragm parts 7a installed in and around the driving part 7c. The operating rod 5 consists of a rod base 30 and an elastic arm 40. This rod base 30 has a mounting hole 5b being coupled with the driving part 7c at both ends. The elastic arm 40 has a coupling hole 5a to be engaged with the driving shaft 3 and an elastic part 41 with elasticity in a direction parallel with a displaceable surface of the diaphragm body 7. In this connection, and end of this elastic arm 40 is integrally installed by the rod base 30 in a projecting manner.

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 Conventionally, as a pump device of this type, there is one shown in 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. A through hole 4b for passing the mounting screw 20 of the motor 1 is provided in the vicinity of the central portion, and the motor mounting base 4 is provided at the outer peripheral corner portion.
There are provided mounting holes 4c for screwing with other members. 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. The coupling hole 5a has an oval shape in a direction parallel to a displaceable surface of the diaphragm, which will be described later, and the length of the coupling hole 5a is equal to or slightly larger than the maximum amplitude of the drive shaft 3 eccentrically attached to the output shaft 2 of the motor 1. It is small, and the curvature of the inner diameter of both ends is larger than the curvature of the drive shaft 3.

Reference numeral 6 is a rectangular box-shaped case having an opening on one side, and four mounting holes 6c are provided at the outer corners, the opening surface is fitted to the motor mounting base 4, and the box bottom is described later. It has an insertion hole 6a for inserting and holding the diaphragm body 7 and the base 8 in the case 6, and a vent hole 6 for guiding the air introduced into the case 6 to an intake valve 7e described later.
b is installed.

Reference numeral 7 is a diaphragm body formed of an elastic body such as rubber. This diaphragm body 7 is constructed by arranging basic diaphragm bodies 7'having the same shape in point symmetry around the output shaft 2 of the motor 1. ing. The basic diaphragm body 7'is formed in a substantially rectangular shape with through holes 21 through which mounting screws are inserted at two corners, and each basic diaphragm body 7'has an inclined surface and is formed in a substantially rectangular oblique columnar shape. The extended diaphragm portions 7a are three-dimensionally extended with respect to the planes of the respective basic diaphragm bodies 7 ', and are three-dimensionally and integrally faced to each other on the outer circumference of the output shaft 2 by 180 degrees, and the sloped surface is the output shaft center. One bag is formed on each of the basic diaphragm bodies 7 ′ so as to be located on the side, and a semicircular portion 7 b, which acts as a bellows over the entire circumference, is formed on the upper surface of the diaphragm portion 7 a with the same wall thickness as the diaphragm portion 7 a. It is provided in. Further, the diaphragm portion 7
At the center of a, a drive portion 7c for varying the volume in the diaphragm portion 7a to perform a pumping action is formed thickly in order to increase the rigidity and is equal in height from the bottom to the head of the diaphragm portion 7a. There is. 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. A long piece portion 7f is provided so as to project upward from the head portion 7d.
When attaching c to the operating rod 5, the long piece 7f is inserted into the attachment hole 5b, and then the long piece 7f is pulled to move the head 7d.
Is projected on the surface of the operating rod 5 and the long piece portion 7f is cut, so that the drive portion 7c 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, and is installed on each of the basic diaphragms 7 ', facing each other by 180 degrees in the central minor axis direction of the diaphragm body 7.

Reference numeral 8 is a rectangular plate-shaped base having mounting holes 22 at 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. Air chamber 9
Is an air chamber 9 on the outer side in the motor radial direction with respect to the drive unit 7c.
Since 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. On the side where the base 8 is pressed against the diaphragm body 7, a substantially rectangular standing wall 10 having a shape similar to the three-dimensional surface of the diaphragm portion 7a is provided, and the height of the standing wall 10 is parallel to the short axis of the base 8. The standing wall 10a near the center is formed lower than the standing wall 10b on the far side, and the standing walls 10c on the other two sides parallel to the long axis of the base 8 are sloped walls connecting 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, 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 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,
Although the drive shaft 3 rotates, since the coupling hole 5a of the operating rod 5 is long in the direction parallel to the diaphragm displaceable surface, the operating rod 5 is in the direction connecting the output shaft 2 of the motor 1 and the two diaphragm portions 7a in the vertical plane. Then, the driving portion 7c of the diaphragm portion 7a performs the same linear movement as the operating rod 5. At this time, as seen from the output shaft 2 side of the motor 1, the step of increasing the distance from the tip of the operating rod 5 (half round of circular motion),
In other words, when the tip of the operating rod 5 moves so as to move away from the output shaft 2 in the radial direction, the drive section 7c is also displaced in the radial direction in the same manner, and the volume of the air chamber 9 falls on the slope of the diaphragm. Since only the surface of the air chamber 9a is configured to be displaceable, the air chamber 9a is compressed and its volume is reduced, while the air chamber 9b is expanded and its volume is increased, but the volume of the air chamber 9a is larger than that of the air chamber 9a. Since it is larger than the volume of 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 reducing the volume of the air chamber 9, the pressure in the air chamber 9 is increased and the suction 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. Since the air chambers 9 are installed 180 degrees apart from each other and facing each other, the suction and compression processes of both are exactly opposite, and when one is sucking air, the other air chamber 9 is This means that the process of compressing air is being performed.

[0011]

However, in the pump device as described above, when performing the pumping action, the drive shaft 3 and the coupling hole are coupled by the reaction force from the diaphragm portion 7a as shown in FIG. A frictional force is generated between the side surfaces of 5a. The direction of the frictional force is opposite when pressing one of the basic diaphragm bodies 7 ′ and when pressing the other, and these act on the actuating rod 5 as a couple about the output shaft 2 of the motor 1. Therefore, the operating rod 5 vibrates while tilting with respect to the line connecting the two diaphragms, and the displacement amount of the operating rod 5 decreases with respect to the displacement amount of the drive shaft 3, resulting in a decrease in the total closing pressure. Had. Further, since the drive shaft 3 is in translational friction with the side wall of the coupling hole 5a of the actuating rod 5, the width of the coupling hole 5a cannot be narrowed up to the diameter of the drive shaft 3, and the driving shaft 3 and the coupling hole 5a are not able to be narrowed. It has a drawback that vibration and noise are generated in the gap formed between the two. Further, the operating rod 5 is deformed by the reaction force of the diaphragm portion 7a, the displacement amount of the operating rod 5 is reduced with respect to the displacement amount of the drive shaft 3, and this also has a drawback that the total closing pressure is reduced. Was there.

An object of the present invention is to solve the above problems, and an object of the present invention is to provide a small pump device in which the displacement amount of the operating rod is not reduced and the total closing pressure is high.

[0013]

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 the small-sized pump device in which only the surface of the diaphragm portion 7a provided around the drive portion 7c that faces the output shaft 2 of the motor 1 can be displaced, the operating rod 5 is composed of the rod base 30 and the elastic arm 40. The rod base 30 has mounting holes 5b at both ends to which the driving portions 7c are coupled, and the elastic arm 40 is parallel to the coupling hole 5a to which the driving shaft 3 is engaged and the displaceable surface of the diaphragm body 7. Has an elastic portion 41 with elasticity, and the end portion of the elastic arm 40 has a rod base 3
It is characterized in that it is integrally projected from zero.

In the invention of claim 2, the output shaft 2 of the motor 1 is
A diaphragm provided with a drive shaft 3 which is eccentrically mounted on the drive shaft, an operating rod 5 which reciprocates in the radial direction of the motor by the rotation of the drive shaft 3, and an air chamber 9 which is compressed / expanded by the operating rod 5 to perform a pumping action. The diaphragm body 7 includes a body 7 and a driving portion 7c which is connected to the working rod 5 and compresses and expands the air chamber 9 by the reciprocating motion of the working rod 5.
In the small 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 is displaceable, the operating rod 5 includes the rod base 30 and the crank arm. The rod base 30 has a mounting hole 5b into which the driving portion 7c is coupled and a crank support portion 31 to which one end of the crank arm 50 is attached. The crank arm 50 has a driving shaft at the other end. 3 and the crank support portion 31
It is characterized in that it has a rotation support portion 51 axially attached to the crank support portion 51 of the rod base 30 and the rotation support portion 51 of the crank arm 50 is rotatably coupled to the crank support portion 31 of the rod base 30.

According to a third aspect of the present invention, in the first or second aspect, the rod base 30 of the actuating rod 5 is provided with a reinforcing member 60 that provides strength in a direction orthogonal to the displaceable surface of the diaphragm body 7. It is characterized by. According to a fourth aspect of the present invention, in the third aspect, the operating rod 5 has a mounting hole 5b that is coupled to the drive portion 7c and a coupling hole 5a that is coupled to the drive shaft 3, and the coupling hole 5a is the diaphragm body 7.
It is characterized by having an elliptical shape in a direction parallel to the displaceable surface.

[0016]

According to the first aspect of the present invention, the operating rod 5 reciprocates without reducing the displacement amount of the drive shaft 3 through the elastic arm 40 which is integrally projected from the rod base 30 through the elastic portion 41. The volume of the air chamber 9 is changed in response to the reciprocating movement of the operating rod 5 to perform a pumping action.

According to the second aspect of the present invention, the operating rod 5 is reciprocated without reducing the displacement amount of the drive shaft 3 via the crank arm 50 pivotally mounted on the rod base 30, and the operating rod 5 is reciprocated. A volume change occurs in the air chamber 9 according to the reciprocating motion, and a pump action is performed. In the inventions of claims 3 and 4, the operating rod 5 reinforced by the reinforcing member 60 is reciprocated without being deformed by the diaphragm reaction force, and the operating rod 5 is prevented from being deformed.
A volume change occurs in the air chamber 9 in response to the reciprocating movement of, and a pump action is performed.

[0018]

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.

Numeral 5 is a substantially rod-shaped actuating rod, which is provided with a coupling hole 5a for coupling with the drive shaft 3 in the central portion, and mounting holes for mounting a diaphragm body 7 described later on the working rod 5 at both ends. 5b is provided. This operating rod 5 has a substantially U-shaped rod base 30 as shown in FIG.
And an elastic arm 40 integrally provided on the rod base 30.
The main body is constituted by and, and mounting holes 5b are provided at both ends of the rod base 30. The elastic arm 40 is integrally formed at the other end of an elastic portion 41 that integrally projects from one end of the rod base 30, and the drive shaft 3 is engaged at the tip portion located at the center of the rod base 30. A coupling hole 5a to be fitted is provided. As long as the drive shaft 3 to be inserted is rotatable, the connecting hole 5a has a small gap between the drive shaft 3 and the drive shaft 3, and the drive shaft 3 is inserted so that vibration and noise are less likely to occur due to the gap. It is the hole diameter. Elastic part 4
1, one end is integrally projected from one end of the rod base 30,
Since the other end provided with the elastic arm 40 is in a free state, it has elasticity in a direction parallel to the displaceable surface of the diaphragm body 7, and the elastic arm 40 has a rod base as shown in FIG. It is movable in a direction orthogonal to the longitudinal direction of the table 30.

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 box bottom is described later. It has an insertion hole 6a for inserting and holding the diaphragm body 7 and the base 8 in the case 6, and a vent hole 6 for guiding the air introduced into the case 6 to an intake valve 7e described later.
b is installed.

Reference numeral 7 is a diaphragm body formed of an elastic body such as rubber. This diaphragm body 7 is formed by arranging basic diaphragm bodies 7'having the same shape in point symmetry around the output shaft 2 of the motor 1. ing. The basic diaphragm body 7'is formed in a substantially rectangular shape with through holes 21 through which mounting screws are inserted at two corners, and each basic diaphragm body 7'has an inclined surface and is formed in a substantially rectangular oblique columnar shape. The extended diaphragm portions 7a are three-dimensionally extended with respect to the planes of the respective basic diaphragm bodies 7 ', and are three-dimensionally and integrally faced to each other on the outer circumference of the output shaft 2 by 180 degrees, and the sloped surface is the output shaft center. One bag is formed on each of the basic diaphragm bodies 7 ′ so as to be located on the side, and a semicircular portion 7 b, which acts as a bellows over the entire circumference, is formed on the upper surface of the diaphragm portion 7 a with the same wall thickness as the diaphragm portion 7 a. It is provided in. Further, the diaphragm portion 7
At the center of a, a driving portion 7c for varying the volume in the diaphragm portion 7a to perform a pumping action is formed thickly in order to increase the rigidity and is equal in height from the bottom to the head of the diaphragm portion 7a. There is. 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. A long piece portion 7f is provided so as to project upward from the head portion 7d.
When attaching c to the operating rod 5, the long piece 7f is inserted into the attachment hole 5b, and then the long piece 7f is pulled to move the head 7d.
Is projected on the surface of the operating rod 5 and the long piece portion 7f is cut, so that the drive portion 7c 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, and is installed on each of the basic diaphragms 7 ', facing each other by 180 degrees in the central minor axis direction of 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. Air chamber 9
Is an air chamber 9 on the outer side in the motor radial direction with respect to the drive unit 7c.
Since 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. 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 10
c is a sloped wall that connects the two walls. 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. A groove-shaped suction passage 8c is provided for guiding the air passing through the valve 7e 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 sides of which are the standing wall 10b of the base 8 and 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.

Next, the operation of the small pump device of the present invention will be described. When the motor 1 is energized and the output shaft 2 rotates, the coupling hole 5a of the operating rod 5 makes a circular motion with the rotation of the drive shaft 3, but the elastic portion 41 is displaced in the direction parallel to the displaceable surface of the diaphragm body 7. In order to do so, the actuating rod 5 makes a linear reciprocating movement by taking out the movement in the direction connecting the two diaphragm portions 7a in the plane perpendicular to the output shaft 2, and the elastic arm 4
The actuating rod 5 is reciprocated without reducing the displacement amount of the drive shaft 3 through 0, and the drive portion 7c also performs the same linear reciprocating motion as the actuating rod 5. At this time, the motor 1
The step of increasing the distance from the output shaft 2 to the tip of the working rod 5 (half circle of circular motion), that is, the movement of the tip of the working rod 5 away from the output shaft 2 in the radial direction. In this case, 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 inclined surface of the diaphragm. Therefore, the air chamber 9a is compressed and its volume decreases. On the other hand, although the volume of the air chamber 9b is expanded and the volume of the air chamber 9b is increased, the volume of the air chamber 9a is larger than that of the air chamber 9b.
The volume of is decreasing. 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. When the drive unit 7c
Is similarly displaced inward in the radial direction, and the volume of the air chamber 9 is increased 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 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. When the pumping action is performed in response to the movement of the operating rod 5, the operating rod 5 is reciprocated without reducing the displacement amount of the driving shaft 3 via the elastic arm 40, so that the displacement of the driving shaft 3 is changed. The displacement amount of the operating rod 5 can be obtained in the same amount as the amount, and the total closing pressure is increased. 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 FIGS. This is different from the first embodiment mainly in the shape of the operating rod 5, and has a motor 1, an output shaft 2, a drive shaft 3, a motor mount 4, and a case 6 as members having the same basic functions. , Diaphragm 7, base 8, exhaust valve 1
1, the lid 12 is given the same reference numeral, and detailed description thereof is omitted. That is, in this embodiment, the parts other than the actuating rod 5 are the same as in the first embodiment.

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 thereof, and mounting holes for mounting a diaphragm body 7 described later on the working rod 5 at both ends. 5b is provided. This operating rod 5 has a substantially U-shaped rod base 30 as shown in FIG.
And a crank arm 50 integrally provided on the rod base 30 mainly constitute the main body, and mounting holes 5b are provided at both ends of the rod base 30. Crank arm 50
Has a coupling hole 5a into which the drive shaft 3 is inserted, and a rotation support portion 51 provided at the other end. The crank support portion 3 is provided with the rotation support portion 51 protruding from the rod base 30.
It is connected to 1 so as to be horizontally rotatable. Coupling hole 5a
As long as the drive shaft 3 to be inserted can rotate, the size of the gap between the drive shaft 3 and the drive shaft 3 is small, and the drive shaft 3 is inserted so that vibration and noise are less likely to occur due to an unnecessary gap. Hole diameter. Further, the crank support portion 31 of the rod base 30 and the rotation support portion 5 of the crank arm 50.
The gap between the shaft mounting portion 1 and the shaft mounting portion 1 is closed as long as both can rotate, and the crank arm 50 and the rod base 30 are mounted on the shaft so that vibration and noise are less likely to occur due to the unnecessary gap. It has become. The crank arm 50 has a rotation support portion 51 at the other end connected to the crank support portion 31 of the rod base 30 so as to be horizontally rotatable, so that the one end provided with the coupling hole 5a has a rod as shown in FIG. It is movable in a direction orthogonal to the longitudinal direction of the base 30.

Even in this case, when the pumping action is performed according to the movement of the operating rod 5, the operating rod 5 is reciprocated without the displacement amount of the drive shaft 3 being reduced through the crank arm 50. Therefore, the displacement amount of the actuating rod 5 can be obtained as much as the displacement amount of the drive shaft 3, and the total closing pressure is increased. Next, a third embodiment of the present invention is shown in FIGS. This is different from the first embodiment mainly in the shape of the operating rod 5,
The motor 1, the output shaft 2, which are the members having the same basic functions,
The drive shaft 3, the motor mount 4, the case 6, the diaphragm body 7, the base 8, the exhaust valve 11, and the lid 12 are designated by the same reference numerals, and detailed description thereof will be omitted. That is, also in this embodiment, the parts other than the actuating rod 5 are the same as in the first embodiment.

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 thereof, and mounting holes 5b for mounting the diaphragm body 7 on the actuating rod 5 at both ends. It is provided. As shown in FIG. 11, the operating rod 5 is provided between a rod base 30 having a substantially U shape, an elastic arm 40 integrally provided on the rod base 30, and an upper end of the rod base 30. The reinforcing member 60 and the main body are mainly formed, and mounting holes 5b are provided at both ends of the rod base 30. The elastic arm 40 is integrally formed at the other end of an elastic portion 41 that integrally projects from one end of the rod base 30, and the drive shaft 3 is engaged at the tip portion located at the center of the rod base 30. A coupling hole 5a to be fitted is provided. As long as the drive shaft 3 to be inserted is rotatable, the connecting hole 5a has a small gap between the drive shaft 3 and the drive shaft 3, and the drive shaft 3 is inserted so that vibration and noise are less likely to occur due to the gap. It is the hole diameter. Elastic part 41
Has one end projecting from one end of the rod base 30 and the other end provided with the elastic arm 40 in a free state, and therefore has elasticity in a direction parallel to the displaceable surface of the diaphragm body 7. Therefore, the elastic arm 40 is movable in the direction orthogonal to the longitudinal direction of the rod base 30 as shown in FIG. A reinforcing member 60 is installed over both ends of the rod base 30 so as to be located above the elastic arm 40, and the reinforcing member 60 enhances the strength of the operating rod 5 in the moving direction. The reinforcing member 60 is formed in a ladder shape so as not to interfere with the output shaft 2 and the drive shaft 3. When providing the reinforcing member 60 on the upper part of the rod base 30, the rod base 30 and the reinforcing member 60 may be integrally formed as long as there is no problem such as molding. Further, the reinforcing member 60 and the rod base 30 may be made of the same material, but if the strength is further increased, a material having high rigidity may be used.

Here, when the reinforcing member 60 is not provided on the upper portion of the rod base 30, the operating rod is deformed by the diaphragm reaction force as shown in FIG. Although it is considered that the displacement amount of the rod 5 is reduced by the dimension a in FIG. 13, the reinforcing member 60
With the provision of, the actuating rod 5 can be prevented from being deformed and the displacement amount can be prevented from decreasing. That is, the displacement amount of the drive shaft 3 can be transmitted to the drive unit 7c via the operation rod 5 without reducing the displacement amount, and the displacement amount of the operation rod 5 can be obtained by the same amount as the displacement amount of the drive shaft 3. Therefore, the total closing pressure can be increased. In FIG. 13, an arrow B indicates a force pushed by the motor 1, and an arrow C indicates a reaction force from the air chamber 9.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.
7 shows. This is different from the first embodiment mainly in the shape of the operating rod 5, and has a motor 1, an output shaft 2, a drive shaft 3, a motor mount 4, and a case 6 as members having the same basic functions. The diaphragm 7, the base 8, the exhaust valve 11, and the lid 12 are designated by the same reference numerals, and detailed description thereof will be omitted. That is, also in this embodiment, the operating rod 5
The other parts are the same as those in the first embodiment.

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 central portion, and mounting holes 5b for mounting the diaphragm body 7 on the operating rod 5 at both ends. It is provided. As shown in FIG. 16, the operating rod 5 includes a substantially U-shaped rod base 30 and a crank arm 50 integrally provided on the rod base 30.
And a reinforcing member 60 provided between both upper ends of the rod base 30 mainly constitute the main body, and mounting holes 5b are provided at both ends of the rod base 30. Crank arm 50
Has a coupling hole 5a into which the drive shaft 3 is inserted, and a rotation support portion 51 provided at the other end. The crank support portion 3 is provided with the rotation support portion 51 protruding from the rod base 30.
It is connected to 1 so as to be horizontally rotatable. Coupling hole 5a
As long as the drive shaft 3 to be inserted can rotate, the size of the gap between the drive shaft 3 and the drive shaft 3 is small, and the drive shaft 3 is inserted so that vibration and noise are less likely to occur due to an unnecessary gap. Hole diameter. Further, the crank support portion 31 of the rod base 30 and the rotation support portion 5 of the crank arm 50.
The gap between the shaft mounting portion 1 and the shaft mounting portion 1 is closed as long as both can rotate, and the crank arm 50 and the rod base 30 are mounted on the shaft so that vibration and noise are less likely to occur due to the unnecessary gap. It has become. The crank arm 50 has a rotation support portion 51 at the other end, and a crank support 3 of the rod base 30.
1 is rotatably connected to the connecting hole 5
One end provided with a is movable in a direction orthogonal to the longitudinal direction of the rod base 30 as shown in FIG. A reinforcing member 60 is provided over both ends of the rod base 30 so as to be located above the crank arm 50, and the reinforcing member 60 enhances the strength of the operating rod 5 in the moving direction. A pair of the reinforcing members 60 are installed so as to face each other across the end portions of the rod base 30 so that the upper portions of the reinforcing members 60 are open so as not to interfere with the output shaft 2 and the drive shaft 3. When providing the reinforcing member 60 on the upper part of the rod base 30, the rod base 30 and the reinforcing member 60 may be integrally formed as long as there is no problem such as molding. In addition, the reinforcing member 60 and the rod base 3
The material of 0 may be the same, but if the strength is further increased, a material having high rigidity may be used.

Here, when the reinforcing member 60 is not provided on the upper portion of the rod base 30, the operating rod 5 is deformed by the diaphragm reaction force as shown in FIG. Although it is considered that the displacement amount of the operating rod 5 is reduced by the dimension D in FIG. 18, the reinforcing member 6
When 0 is provided, the deformation of the operating rod 5 is prevented, and the displacement amount can be prevented from decreasing. That is, the displacement amount of the drive shaft 3 can be transmitted to the drive unit 7c via the operation rod 5 without reducing the displacement amount, and the displacement amount of the operation rod 5 can be obtained by the same amount as the displacement amount of the drive shaft 3. Therefore, the total closing pressure can be increased. In FIG. 13, arrow E shows the force pushed by the motor 1, and arrow F shows the reaction force from the air chamber 9.

Next, a fifth embodiment of the present invention will be described with reference to FIGS.
2 shows. This is different from the first embodiment mainly in the shape of the operating rod 5, and has a motor 1, an output shaft 2, a drive shaft 3, a motor mount 4, and a case 6 as members having the same basic functions. The diaphragm 7, the base 8, the exhaust valve 11, and the lid 12 are designated by the same reference numerals, and detailed description thereof will be omitted. That is, also in this embodiment, the operating rod 5
The other parts are the same as those in the first embodiment.

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 central portion, and mounting holes 5b for mounting the diaphragm body 7 on the operating rod 5 at both ends. It is provided. As shown in FIG. 21, the operating rod 5 is mainly composed of a substantially U-shaped rod base 30 and a reinforcing member 60 that is installed between both upper ends of the rod base 30. Mounting holes 5b are provided at both ends of 30. The coupling hole 5a has an oval shape in a direction parallel to the displaceable surface of the diaphragm.
Is equal to or slightly smaller than the maximum amplitude of the drive shaft 3 eccentrically attached to the output shaft 2 of the motor 1, and the curvature of the inner diameter of both ends thereof is formed to be larger than the curvature of the drive shaft 3. ing. A reinforcing member 60 is provided on the upper part of the rod base 30 so as to be located above the coupling hole 5a so as to extend between both ends thereof.
The strength in the direction of movement is increased. The reinforcing member 60 is formed in a ladder shape so as not to interfere with the output shaft 2 and the drive shaft 3. When providing the reinforcing member 60 on the upper part of the rod base 30, if there is no problem such as molding, the rod base 30
The reinforcing member 60 and the reinforcing member 60 may be integrally formed.
Further, the reinforcing member 60 and the rod base 30 may be made of the same material, but if the strength is further increased, a material having high rigidity may be used.

Here, when the reinforcing member 60 is not provided on the upper part of the rod base 30, the working rod 5 is deformed by the diaphragm reaction force as shown in FIG. The displacement of the operating rod 5 is shown in FIG.
Although it will be reduced by the intermediate size, if the reinforcing member 60 is provided, the deformation of the operating rod 5 can be prevented, and the displacement amount can be prevented from decreasing. That is, the displacement amount of the drive shaft 3 can be transmitted to the drive unit 7c via the operation rod 5 without reducing the displacement amount. In FIG. 22, arrow H indicates the force pushed by the motor 1, and arrow L indicates the reaction force from the air chamber 9.

[0038]

According to the inventions of claim 1 and claim 2,
It is possible to transmit to the drive unit via the operating rod without reducing the displacement amount of the drive shaft, and the reciprocating motion of the operating rod can be efficiently performed without waste.
The displacement amount of the actuating rod can be obtained in the same amount as the displacement amount of the drive shaft, and a small pump device having a high total closing pressure can be provided. Moreover, since the gap between the drive shaft and the coupling hole can be narrowed as much as possible, the generation of vibration and noise can be reduced.

According to the inventions of claims 3 and 4, the actuating rod is not deformed by the diaphragm reaction force due to the presence of the reinforcing member, and the displacement amount of the actuating rod is obtained by the same amount as the displacement amount of the drive shaft. Therefore, it is possible to provide a small pump device having a high total closing pressure.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the overall configuration.

3A and 3B show an operating rod, in which FIG. 3A is a plan view and FIG. 3B is a side view.

4 (a), (b) and (c) are plan views showing the operation of the operating rod.

FIG. 5 is a sectional view showing a second embodiment of the present invention.

FIG. 6 is an exploded perspective view showing the overall configuration.

7A and 7B show an operating rod, FIG. 7A is a plan view, and FIG. 7B is a side view.

8A, 8B, and 8C are plan views showing the action of the operating rod.

FIG. 9 is a sectional view showing a third embodiment of the present invention.

FIG. 10 is an exploded perspective view showing the overall configuration.

11A and 11B show an operating rod, in which FIG. 11A is a plan view and FIG. 11B is a side view.

12 (a), (b) and (c) are plan views showing the action of the operating rod.

FIG. 13 is an explanatory diagram illustrating a deformed state of the operating rod.

FIG. 14 is a sectional view showing a fourth embodiment of the present invention.

FIG. 15 is an exploded perspective view showing the overall configuration.

16A and 16B show an operating rod, FIG. 16A is a plan view, and FIG. 16B is a side view.

17 (a), (b) and (c) are plan views showing the action of the operating rod.

FIG. 18 is an explanatory diagram illustrating a deformed state of the operating rod.

FIG. 19 is a sectional view showing a fifth embodiment of the present invention.

FIG. 20 is an exploded perspective view showing the overall configuration.

21A and 21B show an operating rod, in which FIG. 21A is a plan view and FIG. 21B is a side view.

FIG. 22 is an explanatory diagram illustrating a deformed state of the operating rod.

FIG. 23 is a cross-sectional view showing a conventional example.

FIG. 24 is an exploded perspective view of a conventional example.

FIG. 25 shows a diaphragm body in a conventional example, (a) is a plan view, (b) is a sectional view, and (c) is a bottom view.

FIG. 26 is an explanatory view for explaining the action of the operating rod in the conventional example.

[Explanation of symbols]

 1 Motor 2 Output Shaft 3 Drive Shaft 5 Actuating Rod 5a Coupling Hole 5b Mounting Hole 7 Diaphragm Body 7a Diaphragm Section 7c Drive Section 9 Air Chamber 30 Rod Base 31 Crank Support Section 40 Elastic Arm 41 Elastic Section 50 Crank Arm 51 Rotation Support Section 60 Reinforcement member

Claims (4)

[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 in which only the surface facing the output shaft of the motor can be displaced, the operating rod is composed of a rod base and an elastic arm, and the rod base has mounting holes at both ends to which the drive unit is connected. The elastic arm has a coupling hole with which the drive shaft is engaged and an elastic portion having elasticity in a direction parallel to the displaceable surface of the diaphragm body, and the end of the elastic arm integrally projects from the rod base. A small pump device characterized by being installed. 2. A drive shaft eccentrically attached to an output shaft of a motor, an operating rod reciprocating in a radial direction of the motor due to rotation of the drive shaft, and an air chamber which 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-sized pump device capable of displacing only a surface facing a motor output shaft, an operating rod includes a rod base and a crank arm, and the rod base has a mounting hole to which a drive unit is coupled and a crank arm. Has a crank support portion at one end of which is pivotally mounted, and the crank arm has a coupling hole at the other end for coupling a drive shaft and a rotary support pivotally mounted at the crank support portion. A small pump device characterized in that a rotary support portion of a crank arm is rotatably coupled to a crank support portion of a rod base. 3. The small pump device according to claim 1, wherein the rod base of the actuating rod is provided with a reinforcing member that imparts strength in a direction orthogonal to the displaceable surface of the diaphragm body. 4. The actuating rod has a mounting hole to be coupled to the driving portion and a coupling hole to be coupled to the driving shaft, and the coupling hole has an oval shape in a direction parallel to the displaceable surface of the diaphragm body. The small-sized pump device according to claim 3, wherein