JP2000120550A - Air chamber structure of small sized pump device for sphygmomanometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a diaphragm along an inner wall of a recessed part and an external wall of a projection part in a condition in which an air chamber is compressed, resolve unnecessary deformation of the diaphragm, shorten a pressurizing time, and improve pressurizing force by arranging a case having the recessed part and a driving body having the projection part. SOLUTION: When current-carrying to a motor part 1 is carried out, a rotor 7 fixed to an output shaft 5 is rotated. When a driving body 37 nearest approaches the motor part 1 through a driving body pin 43 engaged with a diagonal shaped recessed groove 45 of the rotor 7, an air chamber 31 formed by a diaphragm 11 fixed to the driving body 37 is expanded. As a result, pressure in the air chamber 31 is reduced,. air accumulated in an intake chamber 35 is made to pass an intake hole 23 bypassing an intake passage 27, an intake valve 19 is pushed and opened, and the air flows into the air chamber 31. In this time, a recessed part 39 is formed on a ventilation cover 132, a projection part 41 is formed on the driving body 37, and thereby, the diaphragm 11 is formed along an inner wall of the recessed part 39 and external wall of the projection part 41 os as to prevent unnecessary deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air chamber structure of a small pump device used as a means for sending air to a cuff band of a sphygmomanometer or various air supplies to pressurize.

[0002]

2. Description of the Related Art A general sphygmomanometer has an appearance as shown in FIG. 4 and a structure as shown in FIG.

When the sphygmomanometer removes the main body cover 79, there are an electromagnetic valve 87, a display panel 81, a control circuit 93, a small pump device 91, a pressure sensor 89, a slow leak valve 85, a cuff band 83 and a small pump device. The hollow tube 95 connects the 91, the slow leak valve 85, the electromagnetic valve 87, and the pressure sensor 89.

When the measurement switch is turned on after the power of the sphygmomanometer is turned on, the solenoid valve is closed, the small pump device performs a pumping operation, and rapidly supplies air to the cuff band to pressurize the cuff band. Then, when the pressure sensor detects that the cuff band has been pressurized to the set value, the small pump device is stopped, and the pressure in the cuff band is reduced by gradually discharging air at a low speed through the slow leak valve. The pressure change is measured while reducing the pressure, and the blood pressure value and pulse are measured. When the measurement is completed, the solenoid valve is released to quickly exhaust the air remaining in the cuff band. Then, the measurement result is displayed on the display panel.

[0005] As a small pump device used in these sphygmomanometers, there is a device disclosed in Japanese Patent No. 2555177. As shown in FIG. 6, reference numeral 101 denotes a small DC motor, and 103 denotes an output shaft of the small DC motor 101. Numeral 105 denotes a case attached to the output shaft surface of the small DC motor 101. Reference numeral 107 denotes a collar attached to the output shaft 103.
03 with a predetermined angle, and its tip is the output shaft 1
The drive shaft 109 is mounted so as to be on the central axis of the drive shaft 03. 111 is a disk-shaped driving body, 113 is a diaphragm body, 115 is a bell-shaped diaphragm part extending downward from the diaphragm body 113 and integrally formed, and 117 is at the center thereof. A drive unit 119 is a cylindrical valve body that extends upward from the center of the diaphragm 113 and is integrally formed. The driving unit 117 is pressed into a hole of the driving body 111 and held. Reference numeral 121 denotes a lid, and the lid 121 is fixed to the case 105 with the diaphragm 113 interposed therebetween. The space between the lid 121 and the diaphragm 115 forms pump chambers 123a and 123b. Reference numeral 125 denotes a valve chamber formed upward in the center of the lid 121, and 127 denotes an exhaust port. The valve body 119 is configured to contact the inner peripheral surface of the valve chamber 125 to close the passage. Reference numeral 129 denotes a spherical valve element, and a plurality of intake holes 13 around the valve element.
1 is formed.

[0006] In the small pump device configured as described above, the small DC motor 101 is energized and the output shaft 10
When 3 rotates, the driving shaft 109 also rotates together with the collar 107, whereby the driving body 111 makes a countersunk motion, and the driving section 117 of the diaphragm 113 is vibrated in the vertical direction.
The volume of the pump chamber 123 changes periodically. Drive unit 11
7 moves downward to increase the volume.
3 is depressurized, and the valve body portion 119 is closed in close contact with the valve chamber portion 125. On the contrary, the valve body 129 is opened, and air flows into the pump chamber 123a or 123b from the intake hole 131. Next, when the drive unit 117 moves upward to reduce the volume,
The pressure in the pump chamber 123a or 123b is increased and the valve body 12
9 closes in close contact with the lid 121, and conversely, the valve body 119 is bent inward to open the valve body 119, and the air in the pump chamber 123 a or 123 b is discharged from the exhaust port 127. It has become so.

[0007]

However, in such an air chamber structure of a small pump device, when the air chamber is compressed, the side wall is easily deformed. There is a problem that the air chamber is deformed and expanded, and the volume of the air chamber cannot be sufficiently compressed.

FIG. 7 shows this in detail.
FIG. 7A shows the shape of the air chamber 123a when expanded, and FIG.
FIG. 7B shows an intermediate shape of the air chamber 123a.
(C) shows the compressed shape of the air chamber 123a.

The air chamber 123a has an opening facing an intake hole and an exhaust hole, a thinly formed side wall portion 133, and a bottom portion 135 which is connected to a driving body and hardly deforms. Compression and expansion are performed.

When the air chamber 123a is inflated or in the middle, the side wall 133 of the air chamber 123a does not deform laterally. On the other hand, when the air chamber is compressed, the compressed air flows to the opening and is exhausted, and also flows to the side wall portion 133. Since the side wall portion 133 is thin, the side wall portion 133 is laterally expanded and expanded.

For this reason, in the pump device having the conventional structure, it is necessary to provide a wall by a case body on the outer peripheral surface of the side wall portion 133 in order to eliminate unnecessary deformation of the air chamber, which complicates the structure of the pump device. did.

Accordingly, the present invention provides a small-sized sphygmomanometer pump device capable of preventing unnecessary deformation of the air chamber without providing a side wall on the outer peripheral portion of the air chamber and achieving efficient expansion and compression of the air chamber. It is intended.

[0013]

In order to achieve the above-mentioned object, the present invention provides a case body having a flexible elastic body and a suction / exhaust hole, a driving body connected to an air chamber for compressing and expanding the air chamber. In the air chamber structure of the small pump device for a sphygmomanometer provided with the above, by providing a case body having a concave portion and a driving body having a convex portion, in a state where the air chamber is compressed, the diaphragm is formed on the inner wall of the concave portion. And the shape along the outer wall of the projection, so that the diaphragm does not undergo unnecessary deformation. Therefore, it is possible to provide a small-sized sphygmomanometer pump device capable of achieving a short pressurizing time and a high pressing force.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a sphygmomanometer according to the present invention is shown in FIG.
This is almost the same as that shown in the conventional example of FIG. Therefore,
The small pump device and the air chamber structure used in the sphygmomanometer of the present invention will be described with reference to the cross-sectional view shown in FIG.

The structure of the small pump device used in the sphygmomanometer is divided into a motor unit 1 and a pump unit 3.

An output shaft 5 extends from the motor unit 1,
A rotating body 7 having a rake-shaped concave groove 45 inclined on a surface perpendicular to the motor output axis direction on an outer peripheral portion as shown in a perspective view of FIG. 3 is fixed to the output shaft 5 by press-fitting or bonding. I have.

On the output shaft side of the motor unit 1, a case 9
Is attached by screws or the like, and a screw hole 47 is provided on the surface of the case body 9 opposite to the mounting surface of the motor unit 1. The diaphragm 11 is formed of a flexible elastic material such as rubber, and the ventilation lid is provided. 13, the suction / exhaust cover 17, and the case cover 15 are also provided with the same screw holes, so that they can be fixed to the case body 9 with screws.

A driving member pin 43 is formed on the side of the rotating member of the driving member 37, and the driving member 37 is provided with a grooved groove 4 formed by the rotating member.
5 and the driver pin 43 are loosely fitted and combined.

The upper surface of the driving body 37 and the lower surface of the diaphragm 11 are bonded or provided in a hole formed in a part of the driving body 37.
It is fixed by inserting a sphere having a diameter slightly larger than this hole, and the driving body 37 is fixed by the case body 9.
Since the movement in the radial direction with respect to the output shaft is restricted, and the movement in the rotation direction about the output shaft is also restricted, it is possible to move only in the axial direction.

The intake / exhaust lid 17 has an intake hole 23 and an exhaust hole 25.
Are provided, and there are an intake valve 19 and an exhaust valve 21 for the purpose of preventing gas from flowing backward.

The case cover 15 is provided with an intake passage 27 and an exhaust passage 29, and a space formed between the case cover 15 and the intake / exhaust cover 17 is provided with an intake chamber 35 and an exhaust chamber 33. There is.

When an electric current is applied to the motor and the motor is energized, the rotating body 7 fixed to the output shaft 5 rotates, and the conical groove 45 also rotates.

Here, the expansion and compression movement of the air chamber due to the rotation movement will be described with reference to FIGS.

The cross groove 45 of the rotating body 7 and the driving pin 43 are combined, and the cross groove 45 is
In the state (a), the driving body 37 is located closest to the motor 1, and thus the air chamber 31 formed by the diaphragm 11 fixed to the driving body 37 is inflated.

When the air chamber 31 is expanded, since the pressure in the air chamber 31 is low, the air accumulated in the intake chamber 35 through the intake passage 27 passes through the intake hole 23 and pushes the intake valve 19 open. And flows into the air chamber 31.

When the rotating body rotates and further rotates from the state shown in FIG. 2 (b), and the dovetail groove 45 is located in the state shown in FIG. The air chamber 31 formed by the diaphragm 11 which is located at a distance and is fixed to the driving body 37 is compressed.

At this time, since the ventilation lid 13 has the concave portion 39 and the driving body 37 has the convex portion 41, the diaphragm 11 is concave when the air chamber is compressed. The shape is along the inner wall of the portion 39 and the outer wall of the convex portion 41, so that the diaphragm 11 does not undergo unnecessary deformation.

When the air chamber 31 is compressed, the pressure in the air chamber 31 is high, so that the air in the air chamber 31 passes through the exhaust hole 25, opens the exhaust valve 21, and passes through the exhaust passage 29. Sent into cuff belt.

[0029]

As described above, the present invention provides a small-sized sphygmomanometer having a case body having a flexible elastic body and a suction / exhaust hole, and a driving body connected to the air chamber to compress and expand the air chamber. In the air chamber structure of the pump device, a small pump for a sphygmomanometer that can achieve a short pressurizing time and a high pressurizing force because it is formed by a case body having a concave portion and a driving body having a convex portion. An apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a small pump device according to the present invention.

FIG. 2 is a diagram showing expansion and compression movements of the small pump device of the present invention.

FIG. 3 is a view showing a rotating body of the small pump device of the present invention.

FIG. 4 is a diagram showing a sphygmomanometer.

FIG. 5 is a schematic configuration diagram of a sphygmomanometer.

FIG. 6 is a sectional view of a conventional small pump device.

FIG. 7 is a diagram showing expansion and compression movements of a conventional small pump device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor part 3 Pump part 5 Output shaft 7 Rotating body 9 Case body 11 Diaphragm 13 Vent cover 15 Case cover 17 Intake / exhaust cover 19 Intake valve 21 Exhaust valve 23 Intake hole 25 Exhaust hole 27 Intake passage 29 Exhaust passage 31 Air chamber 33 Exhaust Chamber 35 Intake chamber 37 Driving body 39 Concave part 41 Convex part 43 Driving body pin 45 Taper-shaped concave groove 47 Screw hole

Claims (1)

[Claims] In the air chamber structure of a small sphygmomanometer pump device including a case body having a flexible elastic body and a suction / exhaust hole, and a driving body connected to the air chamber to compress and expand the air chamber, the recess is provided. An air chamber structure of a small pump device for a sphygmomanometer, wherein the air chamber structure is formed by the case body and the driving body having a projection.