JPH06249149A - Small pump device - Google Patents

Abstract

PURPOSE:To provide a small pump device which is provided with high degree of check characteristic, low in cost, and difficult to cause permanent deformation at a diaphragm section in mounting of an operating rod to prevent totally closed pressure from lowering. CONSTITUTION:A mushroom valve 11 is provided so that it is connected to an exhaust valve 7f and exhaust air is checked. Also the mush room valve 11 is formed integrally with a packing 14 so that it is connected to the exhaust valve 7f and exhaust air is checked. Then a joint hole located in a diaphragm section 7a and a joint protrusion located at the end of an operating rod 5 are engaged each other to connect the operating rod to the diaphragm section 7a.

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, the present applicant has previously applied for a patent application No. 4-255235.
This is referred to as an exhaust valve separate type. Referring to FIGS. 7 to 9, 1 is a motor, 2 is an output shaft of the motor 1, and 3 is eccentric with respect to the output shaft 2 by welding or the like. The attached round rod-shaped drive shafts 4 are lid-shaped motor mounting bases for mounting the motor 1, and a through hole 4b for inserting the mounting screw 20 of the motor 1 is provided in the vicinity of the central portion. Mounting holes 4c for screwing the motor mount 4 to other members are provided at the outer peripheral corners, 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 body 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 described later. 7 and base 8
Has an insertion hole 6a for inserting and holding the inside of the case body 6, and a vent hole 6b for introducing the air introduced into the case body 6 to an intake valve 7e described later.

Reference numeral 7 denotes an intake / exhaust valve separate body type diaphragm body formed of an elastic body such as rubber and having a through hole 21 through which mounting screws are provided at four corners, and a sloped surface on the diaphragm body 7. The diaphragm portion 7a formed in a substantially rectangular slanting column shape is three-dimensionally extended with respect to the plane of the diaphragm body 7 and is three-dimensionally and integrally arranged on the outer circumference of the output shaft 2 by 180 degrees relative to each other. Two bags are formed so that the slopes are located on the output shaft center side, and a semicircular portion 7b serving as a bellows is provided on the top of the diaphragm portion 7a over the entire circumference. 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. 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. 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 to have an inclined surface, the volume of the air chamber 9a is larger than the volume 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, valve mounting holes 8a for mounting an umbrella type valve 11, which will be described later, are provided on the surface of the base 8 in each standing wall 10, and a plurality of exhaust holes 8b are provided around the valve mounting holes 8a. And a groove-shaped suction passage 8c for guiding the air passing through the suction 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 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 umbrella valve made of an elastic material 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.

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, as viewed from the output shaft 2 of the motor 1, the step of increasing the distance from the tip of the actuation rod 5 (half round of circular motion), that is, the tip of the actuation rod 5 is radially outward with respect to the output shaft 2. When moving so as to move away, the driving portion 7c is also displaced radially outward, and since the volume of the air chamber 9 is configured to be displaceable only on the surface having the inclined surface of the diaphragm, the air chamber 9a is compressed. Volume decreases, while the air chamber 9b is expanded and the volume increases, but the air chamber 9b
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 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 be closed, while the umbrella 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 suction valve 7e is opened, and the air that has entered the case body 6 through the suction port 4a passes through the ventilation port 6b and the suction passage 8c. And flows into the air chamber 9 to perform an intake operation, while the umbrella valve 11 is closed. Air chamber 9
Are installed 180 degrees apart from each other so that they face each other, so that when one of them is sucking air, the other air chamber 9 is performing an operation of compressing air.

Further, as another conventional example, the intake air
In addition to the one that uses a separate exhaust valve type diaphragm body, both the intake and exhaust valves are integrated with the diaphragm body.
0, there is also an intake / exhaust valve integrated type shown in FIG. This has the same structure as the intake valve 7e provided in the diaphragm body 7 and the exhaust valve 7f is formed by integrally providing the diaphragm body 7 with a tongue-shaped piece, which is formed by the tongue-shaped piece when the pump operates. The exhaust valve 7f is used only to check the exhaust gas to the exhaust passage. 8d is an exhaust path.

[0011]

However, in the pump device of the intake / exhaust valve separate type shown in FIGS. 7 to 9, the umbrella type valve 11 is installed so as to correspond to each exhaust passage. Therefore, it is necessary to install two umbrella-shaped valves 11, and a plurality of umbrella-shaped umbrella-shaped valves 11 are required. Here, since the umbrella-type valve 11 is required to have a high degree of non-return characteristics with little variation, an extremely expensive umbrella that requires deburring using an expensive material is used to meet these requirements. Although it is necessary to use the mold valve 11, if a plurality of umbrella-shaped valves 11 are used as described above, there arises a problem that the cost becomes high. Further, it may be time-consuming to attach the plurality of umbrella-shaped valves 11 and the assembling property may be deteriorated.

Further, in the intake / exhaust valve integrated pump device shown in FIGS. 10 and 11, the diaphragm portion 7 is used.
Since a is periodically subjected to a tensile force or a compressive force by the operating rod 5, its vibration and deformation are transmitted to the umbrella valve 11 through the diaphragm body 7, and it is difficult to obtain a good close contact state between the valve and the valve seat, and there is little variation. It has a problem that it cannot satisfy a high degree of non-return characteristic.

Further, the intake air shown in FIGS.
In the exhaust valve separate type or the intake / exhaust valve integrated type pump device shown in FIGS. 10 and 11, the head portion 7d slightly larger than the outer diameter of the hole diameter of the mounting hole 5b of the operating rod 5 is attached to the mounting hole. 5b is engaged with the rod 5b in a locked state, and the operating rod 5
The driving rod 7c and the driving unit 7c are connected to each other.
While holding the neck of the tip of the robot and pulling strongly, the operating rod 5
It is necessary to attach the head portion 7d to the mounting hole 5b, and the diaphragm portion 7a is permanently deformed, so that the total closing pressure is lowered.

Another object of the present invention is to solve the above problems, and to provide a small-sized pump device which has a high degree of non-reliability and a high level of non-return characteristics and is low in cost. The purpose of the present invention is to provide a small-sized pump device in which the diaphragm portion is unlikely to be permanently deformed when the operating rod is attached and the total closing pressure does not decrease.

[0015]

According to the present invention, in order to achieve the above object, a drive shaft 3 eccentrically attached to an output shaft 2 of a motor 1 and a reciprocating motion in a radial direction of the motor due to rotation of the drive shaft 3. The operating rod 5, the diaphragm body 7 including the air chamber 9 that is compressed / expanded by the operating rod 5 to perform a pumping action, the case body 6 and the base 8 that clamp and fix the diaphragm body 7, and the packing 14. It has a lid 12 attached to the base 8 so as to be located on the opposite side of the diaphragm body 7 via the same, is connected to the operating rod 5, and compresses and expands the air chamber 9 by the reciprocating motion of the operating rod 5. A plurality of drive units 7c are provided on the diaphragm body 7, and each drive unit 7c
Of the diaphragm portion 7a provided around c, only the surface facing the output shaft 2 of the motor 1 can be displaced, and the intake valve 7e and the exhaust valve 7f corresponding to each diaphragm portion 7a are integrated with the diaphragm body 7. The formed small-sized pump device is characterized in that it is provided with one umbrella-type valve 11 so as to communicate with the exhaust valve 7f and check the exhaust gas reversely.

Further, the second aspect of the present invention is characterized in that the umbrella-shaped valve 11 is formed integrally with the packing 14 so as to communicate with the exhaust valve 7f and prevent the exhaust from being reversed. . According to the third aspect of the present invention, the drive shaft 3 is eccentrically attached to the output shaft 2 of the motor 1, the operating rod 5 reciprocates in the motor radial direction by the rotation of the drive shaft 3, and the operating rod. 5, a diaphragm body 7 having an air chamber 9 that is compressed / expanded by 5 to perform a pumping action, a case body 6 that clamps and fixes the diaphragm body 7, and a base 8.
It has a lid 12 attached to a base 8 so as to be located on the opposite side of the diaphragm body 7 via a packing 14, and is connected to the operating rod 5 and compresses the air chamber 9 by the reciprocating motion of the operating rod 5. -A plurality of inflating drive parts 7c are provided in the diaphragm body 7, and only the surface of the diaphragm parts 7a provided around each drive part 7c that faces the output shaft 2 of the motor 1 can be displaced, and each diaphragm part 7a. In the small-sized pump device in which the suction valve 7e and the exhaust valve 7f corresponding to the above are integrally formed in the diaphragm body 7, the coupling hole 30 provided in the diaphragm portion 7a and the coupling projection 31 provided at the end portion of the operating rod 5 are provided. The feature is that they are engaged with each other.

[0017]

The diaphragm body 7 causes a volume change in the air chamber 9 in response 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. Air is discharged through each exhaust valve 7f formed integrally with the body 7 and one umbrella-shaped valve 11 while attempting to prevent exhaust from being reversed.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Since the overall structure of the compact pump device of the present invention is the same as that of the conventional example described above, the description of the same parts will be omitted and only the essential parts of the present invention will be described in detail. First, the first embodiment of the present invention shown in FIGS. 1 to 3 will be described in detail. Reference numeral 6 is a rectangular box-shaped case body having an opening on one side, and four mounting holes 6c are provided at the outer corners, the opening surface is fitted with the motor mounting base 4, and the bottom surface of the box is a diaphragm body described later. There are two insertion holes 6a for inserting and holding the base 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 provided. Also, a diaphragm body 7 described later
An exhaust passage 7d that connects an exhaust valve 7f formed integrally with the exhaust valve 7f, a vent hole 7g communicating with an umbrella-shaped valve 11 described later, and an exhaust hole 8b.
Are formed.

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. As shown in FIG. 3, the diaphragm body 7 is provided on the diaphragm body 7. Has a sloping surface, and a diaphragm portion 7a formed in a substantially rectangular slanting column shape is three-dimensionally extended with respect to the plane of the diaphragm body 7 and is three-dimensionally and integrally arranged on the outer circumference of the output shaft 2 by 180 degrees. Relatively, two bags are formed so that the slopes are located on the output shaft center side, and a semicircular portion 7b serving as a bellows is provided over the entire circumference at the top of the diaphragm portion 7a. 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. 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, and is arranged 180 degrees relative to the central minor axis direction of the diaphragm body 7. Reference numeral 7f is a tongue-shaped exhaust valve integrally formed on the diaphragm 7, and is disposed between the diaphragm portions 7a so as to face each other by 180 degrees in the central axis direction of the diaphragm body 7. Also,
A plurality of vent holes 7g for guiding exhaust gas to an umbrella valve 11 described later are provided near the center.

Reference numeral 8 denotes 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 to have an inclined surface, the volume of the air chamber 9a is larger than the volume of the air chamber 9b. 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, and the height of the standing wall 10 is
The standing wall 10a parallel to the minor axis of the base and near the center is lower than the standing wall 10b of the far side, and the other two standing walls 10c parallel to the major axis of the base 8 connect the two walls. It is a sloped wall. Further, a valve mounting hole 8a for mounting an umbrella type valve 11 described later is provided on the surface of the base 8 in the standing wall 10, and exhaust gas is guided to the umbrella type valve 11 around the valve mounting hole 8a. A plurality of exhaust holes 8b are provided, and a groove-shaped suction passage 8c for guiding the air passing through the suction valve 7e to the air chamber 9 is provided. Also, the standing wall 10b
An air passage 8e is provided over the entire length so as to communicate with the suction passage 8c.

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 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 umbrella valve made of an elastic body 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 and integrally fixing the motor mount 4, the case body 6, the diaphragm body 7, the base 8 and the lid 12, and 14 is a space between the base 8 and the lid 12. It is a packing for sealing.

Next, the operation of the pump device according to 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 volume of the air chamber 9b is expanded and the volume of the air chamber 9a is increased, 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.
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 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, the suction valve 7e is opened, and the air that has entered the case body 6 through the suction port 4a passes through the ventilation port 6b and the suction passage 8c. And flows into the air chamber 9 to perform an intake operation, while the exhaust valve 11 is closed. Air chamber 9
Are installed 180 degrees apart from each other, so the suction and compression processes of both are exactly opposite,
When one air chamber 9 is sucking air, the other air chamber 9 is performing the operation of compressing air. Further, each air chamber 9 performs one pumping action by one rotation of the drive shaft 3, but it 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 exhaust port 12a. Pulsation of air discharged from the air chamber 9
Is reduced compared to a single chamber pump.

In this embodiment, the diaphragm portion 7a is
Although it was a two-cylinder structure in which two bags were integrally provided at an interval of 180 degrees, three bags were integrally provided at an interval of 120 degrees.
It may be a cylinder or four cylinders integrally provided with four bags at intervals of 90 degrees. Further, the shape of the bottom surface of the diaphragm portion 7a is not limited to the embodiment, and may be a round shape, an elliptic shape, a polygonal shape, or the like.

Next, a second embodiment of the present invention is shown in FIGS. This is different from the first embodiment mainly in the umbrella type valve 11
The difference is that the umbrella-shaped valve 11 is formed integrally with the packing 14 instead of, and the basic function is the same, so only the packing 14 will be described in detail. The packing 14 is formed of an elastic body, and the umbrella-shaped valve 11 is integrally formed in the central portion. In this case, when the packing 14 is arranged between the base 8 and the lid 12, the operating piece 11a is arranged so as to always close the exhaust hole 8b of the base 8, and the operating piece 11a is exhausted. It is configured so as to be elastically deformed only in the direction in which the hole 8b is opened, so that exhaust gas is discharged while surely preventing exhaust gas from being reversed.

Next, a third embodiment of the present invention is shown in FIG. This is designed so that the umbrella type valve 11 is eliminated and only the exhaust valve 7f is used to obtain the check characteristic. Further, the connection between the actuating rod 5 and the driving portion 7c is configured so that the driving portion 7c can be connected to each other without being strongly pulled, which may cause permanent deformation of the diaphragm portion 7a during assembly. In other words, it is possible to obtain a constant check characteristic without the umbrella-shaped valve 11.

Numeral 5 is a substantially rod-shaped actuating rod, in the center of which a coupling hole 5a for coupling with the drive shaft 3 is provided, and at both ends, coupling projections 31 for mounting a diaphragm body 7 described later on the operating rod 5 are provided. Has been. The coupling projection 31 is integrally formed by partially projecting both ends of the operating rod 5 downward. Reference numeral 7 is a diaphragm body formed of an elastic body such as rubber and having a rectangular shape with holes for attaching screws at the four corners. The diaphragm body 7 is formed in a substantially rectangular slanted column shape with a slope. The diaphragm portion 7a is three-dimensionally extended with respect to the plane of the diaphragm body 3 so that the slopes are three-dimensionally and integrally arranged on the outer circumference of the output shaft 2 by 180 degrees relative to each other so that the slope is located on the output shaft center side. Two bags are formed, and a semicircular portion 7b serving as a bellows is provided on the entire top of the diaphragm portion 7a. Further, at the center of the diaphragm portion 7a, there is a driving portion 7c for varying the volume inside the diaphragm portion 7a to perform a pumping action. The driving portion 7c is provided with a connecting projection 31 of an operating rod for connection. A coupling hole 30 is provided, and the coupling protrusion 31 of the actuating rod 5 is inserted and coupled to drive the driving unit 7.
c is connected to and held by the operating rod 5.

In this case, the coupling projection 3
By inserting 1 into the coupling hole 30, the actuating rod 5 and the drive portion 7c can be connected to each other, without pulling the drive portion 7c with a strong force as in the conventional case. The operating rod 5 and the drive unit 7c can be connected to each other so that the diaphragm unit 7a formed around the drive unit 7c can be mounted without causing permanent deformation at the time of mounting. Has become. That is, since the actuating rod 5 and the driving portion 7c can be connected without causing the diaphragm portion 7a to be permanently deformed, a predetermined non-return check can be made without using the umbrella-type valve 11. The characteristics can be obtained, the number of parts can be reduced, the assemblability can be improved, and the cost can be reduced. Further, in the illustrated one, the portion forming the base 8 is formed integrally with the lid body 12, whereby the number of parts can be reduced to improve the assemblability and the cost can be reduced. However, the base 8 and the lid 12 may be provided separately, and the base 8 may be provided to attach the umbrella-shaped valve 11 or the umbrella-shaped valve 11 may be provided. The packing may be arranged to install the umbrella valve.

[0030]

As described above, according to the present invention, one umbrella-type valve is used to check the exhaust gas to the plurality of exhaust holes. Therefore, the plurality of umbrella-type valves are used to check the exhaust holes. It is possible to stabilize the non-return characteristics without causing variations in the non-return characteristics of each umbrella-type valve as in the case of performing it, and to reduce the cost of the umbrella-type valve. The cost can be reduced. Further, since only one umbrella type valve needs to be provided, the assembling property can be improved.

According to the second aspect of the present invention, the umbrella-shaped valve is formed integrally with the packing so as to communicate with the exhaust valve and to check the exhaust gas. Can be arranged, the members can be shared, the cost can be reduced, and the assemblability can be improved. Further, according to the third aspect of the present invention, the coupling hole provided in the diaphragm portion and the coupling projection provided at the end portion of the actuating rod are engaged with each other. There is no permanent deformation of the diaphragm portion due to pulling, and it is possible to prevent the diaphragm portion from being deformed due to the assembly to reduce the total closing pressure.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

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

3A and 3B show a diaphragm body, FIG. 3A is a plan view, FIG. 3B is a sectional view taken along line AA in FIG. 3A, and FIG.
Is a bottom view.

FIG. 4 is a sectional view of an essential part showing another embodiment.

FIG. 5 shows a packing used in the above,
(A) is a plan view, (b) is a BB line sectional view in (a), (c) is a bottom view.

FIG. 6 is a sectional view of an essential part showing still another embodiment.

FIG. 7 is a sectional view showing a conventional example.

FIG. 8 is an exploded perspective view of the above.

9A and 9B show a diaphragm body used in the same as above, FIG. 9A is a plan view, and FIG. 9B is CC in FIG. 9A.
A line sectional view, (c) is a bottom view.

FIG. 10 is a cross-sectional view showing another conventional example.

FIG. 11 shows a diaphragm body used in the same as above, (a) is a plan view, (b) is a D- in (a).
A sectional view taken along the line D, and (c) is a bottom view.

[Explanation of symbols]

 1 Motor 2 Output Shaft 3 Drive Shaft 5 Actuating Rod 6 Case Body 7 Diaphragm Body 7a Diaphragm Part 7c Drive Part 7e Intake Valve 7f Exhaust Valve 8 Base 9 Air Chamber 11 Umbrella Valve 12 Lid 14 Packing 30 Coupling Hole 31 Coupling Protrusion

Claims (3)

[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 body,
It has a case body and a base that clamps and fixes the diaphragm body, and a lid that is attached to the base so as to be located on the opposite side of the diaphragm body via a packing. A plurality of drive parts for compressing and expanding the air chamber are provided in the diaphragm body, and only the surface of the diaphragm part provided around each drive part facing the output shaft of the motor is displaceable. A small pump device in which corresponding intake valves and exhaust valves are integrally formed in a diaphragm body, which is provided with one umbrella-type valve that communicates with the exhaust valve and reverses exhaust gas. apparatus. 2. The miniature pump device according to claim 1, wherein an umbrella-shaped valve is formed integrally with the packing so as to communicate with the exhaust valve and to check the exhaust gas. 3. A drive shaft eccentrically attached to an output shaft of a motor, an operating rod reciprocating in the 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 body,
It has a case body and a base that clamps and fixes the diaphragm body, and a lid that is attached to the base so as to be located on the opposite side of the diaphragm body via a packing. A plurality of drive parts for compressing and expanding the air chamber are provided in the diaphragm body, and only the surface of the diaphragm part provided around each drive part facing the output shaft of the motor is displaceable. In a small-sized pump device in which corresponding intake valves and exhaust valves are integrally formed in a diaphragm body, a coupling hole provided in the diaphragm portion and a coupling protrusion provided at an end portion of an operating rod are engaged with each other. A small pump device characterized in that