JP2551757B2 - Small pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a small pump which facilitates integration of a motor and a pump and is effective when used in a simple blood pressure monitor or the like.

[Conventional technology]

In recent years, a simple type sphygmomanometer that allows ordinary people to measure their own blood pressure has been sold, and a small and powerful DC motor-driven pump is used for such a sphygmomanometer.

FIG. 7 shows such a conventional small pump,
(A) is a side view and (b) is a front view. In the figure,
41 is a base, 42 is a small DC motor, 43 is an output shaft of the motor 42, 44 is an eccentric cam fixed to the output shaft 43, and 45 is an output shaft 43.
A drive shaft fixed to the eccentric cam 44 at an eccentric position with respect to, a bearing portion in which the drive shaft 45 is loosely inserted, and a bearing portion 47.
A coupling rod integrally formed with 46, and 48 are rubber diaphragms that form a pump structure together with a part of the base 41. The tip of the connecting rod 47 is connected to the central portion of the diaphragm 48. With such a configuration, when the motor 42 is energized and rotates, the drive shaft 45 rotates about the output shaft 43, so that the connecting rod 47 moves up and down. As a result, the diaphragm 48 is pumped because the center portion of the diaphragm 48 moves substantially vertically.

[Problems to be solved by the invention]

However, such a pump has a high height due to the use of a long connecting rod, and since the motor and the diaphragm are arranged apart from each other, the overall shape becomes large, so that the size can be reduced. It was difficult.

Further, if the connecting rod is shortened, it becomes difficult to cause the diaphragm to make a piston movement, so that the diaphragm is forcibly deformed, and the current consumption increases.

[Means for solving problems]

According to the present invention, a drive body that performs a panning motion is provided on an output shaft of a motor, and a drive section at the center of a plurality of diaphragm portions arranged in the circumferential direction is attached to this drive body, and each pump chamber formed by the diaphragm section and The first valve element is provided between the central chamber and the common chamber communicating with the second valve element, and the second valve element is provided between each pump chamber and the outdoor space thereof.

[Action]

When the output shaft of the motor rotates, the driving body makes a panning motion, each diaphragm part expands and contracts in sequence, and air is taken in and discharged by the alternating opening and closing action of both valve bodies.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

FIG. 1 is a sectional front view of an essential part of an embodiment of a small pump according to the present invention, and FIG. 2 is a plan view thereof. FIG. 1 is a view taken along the line AA of FIG.

In these figures, 1 is a small DC motor, 2 is an output shaft of the motor 1, 3 is a cup-shaped member having a diameter substantially the same as that of the motor 1, and the bottom surface is attached to the surface on the output shaft side of the motor 1 with a screw 4. 5 is a collar fixed to the output shaft 2, 6
Is a drive shaft that is inclined to the output shaft 2 by a predetermined angle and is fixed to the collar 5 so that its tip is on the central axis of the output shaft 2, and 7 are formed in a disk shape and are provided at 120 degree intervals. A driving body having three holes 8 formed therein, 9 is a cylindrical support portion integrally formed by extending downwardly at the center of the driving body 7, and 10 is a friction between the driving shaft 6 and the driving body 7 is small. It is a steel ball to do. The support portion 9 is loosely fitted into the drive shaft 6, and when the output shaft 2 rotates, the drive shaft 6 rotates in a tilted state, so that the drive body 7 moves up and down in the peripheral portion having the hole 8 with respect to the center. Then, do a so-called dish turning exercise.

11 is formed in a cup shape, and three cylindrical holes 12 are formed on the bottom surface (which is the upper surface in FIG. 1) at intervals of 120 degrees, and the opening sides thereof are screwed into the opening sides of the case 3. As shown in the plan view of FIG. 3, three screw holes 13 are formed in the middle of each hole 12.

Reference numeral 14 is a disk-shaped diaphragm body made of soft rubber, the plane of which is shown in FIG. 4 and the bottom of which is shown in FIG. Reference numeral 15 denotes three bell-shaped diaphragm portions integrally formed by extending downwardly from the main body at intervals of 120 degrees, 16 is a drive portion at the center of the diaphragm portion, and 17 is formed at the tip of the drive portion 16 through a thin neck portion. The head portion 18 is a cylindrical valve body portion that extends upward from the central portion of the main body and is integrally formed. The head 17 penetrates the hole 8 of the driving body 7 and projects to the lower surface side of the driving body 7, whereby the driving unit 16 is held by the driving body 7. Three holes 19 for passing screws are formed in the diaphragm book 15 at an intermediate position between the diaphragm portions 15.

20 is a circular concave portion formed on the bottom surface with three 120 degree intervals 21
FIG. 6 is a bottom view of a lid body having a. 22 is a recess
A hole formed at the center of 21; 23 intake holes formed around each hole 22; 24 a valve chamber portion formed upward in the center of the lid 20; 25 a valve chamber portion It is an exhaust hole formed by thinly connecting the tip of 24. In addition, 26 shown in FIG. 2 and FIG.
Is a hole formed in the middle of each hole 22 so as to pass a screw. Reference numeral 27 is a screw that penetrates the holes 26 and 19 and is screwed into the screw hole 13. By this screwing, the lid body 20 is fixed to the case 11 with the diaphragm body 14 interposed therebetween,
The recess 21 of 20 and the diaphragm portion 15 form three pump chambers 28. The lid 20 has a common chamber 29 formed in the valve chamber 24, and each recess 21 has a notched groove 30 formed inward (in the direction of the center of the lid) and connected to the common chamber 29. . Therefore, the pump chambers 28 are commonly communicated with the common chamber 29 at the center. The valve body 18 is the valve body
It is in contact with the inner peripheral surface of 24 and closes this communication passage.

31 is a spherical valve body made of soft rubber, 32 is a valve body 31
The support column is integrally formed by extending upward at the center of the support column, and 33 is a thicker head formed at the tip of the support column 32. The valve body 31 is formed in such a size that it sufficiently covers the intake hole 23, and is mounted so that the support column 32 penetrates the hole 22 and the head 33 is exposed to the outside and does not come out to the lid body 20. There is.

Next, the operation of the small pump configured as described above will be described. When the motor 1 is energized and the output shaft 2 rotates, the drive shaft 6 also rotates, which causes the drive body 7 to perform a dish-turning motion and the drive unit 16 of each diaphragm unit 15 swings vertically with a phase difference of 120 degrees. To do. The volume of the pump chamber 28 periodically changes due to the piston movement of the diaphragm portion. When the drive unit 16 moves downward and the volume increases, the pump chamber 28
Is depressurized to close the valve body portion 18 in close contact with the valve chamber portion 24, while the valve body 31 is opened and air flows in through the intake hole 23. next,
When the drive unit 16 moves upward and the volume decreases, the pump chamber
28 is increased in pressure, the valve body 31 is in close contact with the lid body 20 and closes, and conversely, the valve body portion 18 opens the portion that closes the groove portion 30 of the pump chamber 28 and the air in the pump chamber 28 is in the common chamber 29. Through the exhaust hole 25.

Each pump chamber pumps once by one rotation of the driving body, but it is carried out three times as a whole, and the operation efficiency is good.

Further, since the pump chamber is formed integrally with the motor, and moreover, the plurality of pump chambers are arranged in the circumferential direction around the common chamber at the center, and further, the driving body is arranged between the motor and the pump chamber, The pump device and the motor are integrated into one, and the shape is very small. Further, since the pump action is performed by utilizing the dish turning motion of the driving body, it is possible to cause the diaphragm portion to perform the piston motion even in the narrow space, and the pump action is smoothly and efficiently performed.

Although the valve body 18 is integrally formed in a cylindrical shape in this embodiment, it may be divided according to the number of diaphragm portions to close the respective groove portions 30. Further, although three diaphragm portions are provided in this embodiment, two diaphragm portions may be provided at 180 ° intervals and four diaphragm portions may be provided at 90 ° intervals.

〔The invention's effect〕

As described above, according to the small-sized pump of the present invention, the pump device and the motor can be easily integrated with each other, so that an efficient and small-sized pump can be obtained. Extremely effective to use.

[Brief description of drawings]

FIG. 1 is a sectional front view of an essential part of an embodiment of a small pump according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a plan view of a case 11, and FIG. 4 is a plan view of a diaphragm body. The figure is a bottom view thereof, FIG. 6 is a bottom view of the lid 20, FIG. 7 (a) is a side view of a conventional small pump, and FIG. 7 (b) is a front view thereof. 1 ... Small DC motor, 2 ... Output shaft, 3,11 ... Case, 6 ... Drive shaft, 7 ... Driving body, 14 ... Diaphragm body, 15 ... Diaphragm section, 18 ... Valve body section , 20 …… Lid, 23 …… Intake hole, 25 …… Exhaust hole, 28 …… Pump chamber, 29
…… Common room, 30 …… Groove, 31 …… Valve.

Claims (1)

(57) [Claims] 1. A drive body which is provided on an output shaft of a motor in a concentric and inclined manner, and which performs a pan-and-tilt motion by rotation of the output shaft, and a substantially equal interval in the circumferential direction with respect to the shaft center of the output shaft. A plurality of diaphragm portions that are arranged in the respective driving chambers and each driving portion is attached to the driving body, and a cylindrical common chamber that is located in the central portion of the diaphragm portions so as to be surrounded by the diaphragm portions, A first valve body that is disposed so as to be in close contact with the inner wall surface of the common chamber and is integrally formed with each of the diaphragm portions; and a groove portion that is formed in the common chamber and that communicates between each pump chamber and the common chamber. And a second valve body that opens and closes between each of the pump chambers and the outdoor space thereof.