JPH1026082A - Pump device for hemadynamometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of a flow of air from the interior of an air chamber when the air chamber is compressed to the outside of the air chamber and to improve the maximum pressure value of a pump. SOLUTION: An exhaust hole 8b through which air in an air chamber 9 to perform pump operation through compression and expansion effected by an actuating rod 5 is exhausted in an exhaust passage 17 is openable by an exhaust valve 11. The exhaust hole 8b is arranged closer to a direction, in which the air chamber 9 is compressed, than the coupling shaft 11a of the exhaust valve 11. Air in the air chamber 9 is smoothly exhausted through the exhaust hole 8b without dispersion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump device used for a sphygmomanometer.

[0002]

2. Description of the Related Art Conventionally, as a pump device of this type, as shown in FIG. 12, for example, a drive shaft 3 eccentrically mounted on an output shaft 2 of a motor 1 and a rotation of the drive shaft 3 in a radial direction of the motor. It comprises a reciprocating operating rod 5 and a diaphragm body 7 having an air chamber 9 which is compressed / expanded by the operating rod 5 to perform a pump action. The air chamber 9 is compressed / expanded by the reciprocating motion of the operating rod 5. There is known a sphygmomanometer pump device P adapted to be operated.

When the motor 1 is energized and the output shaft 2 rotates, the drive shaft 3 also rotates.
Makes a circular motion in a plane perpendicular to the output shaft 2 of the motor 1 and the diaphragm performs the same circular motion as the operating rod 5, so that the volume of the air chamber 9 increases or decreases to generate a pumping action. By opening the valve portion 11b of the exhaust valve 11 composed of the above, air is supplied from the exhaust hole 8b into the compression band via the exhaust path 17.

[0004]

However, in the prior art,
As shown in FIG. 13, the exhaust hole 8b for exhausting the air in the air chamber 9 to the exhaust path 17 is formed around a valve mounting hole 8a to which the connecting shaft 11a of the exhaust valve 11 is attached. (For example, four) are provided, and the air in the air chamber 9 is exhausted by dispersing through these four exhaust holes 8b. Therefore, the air is exhausted from the air chamber 9 when the valve portion 11b is opened. There is a problem that the efficiency of exhausting to the passage 17 becomes poor, and as a result, it is difficult to increase the maximum pressure value of the pump.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to improve the efficiency of the flow of air from the air chamber to the outside of the air chamber when the air chamber is compressed. It is an object of the present invention to provide a blood pressure monitor pump device capable of improving the maximum pressure value of the pump.

[0006]

In order to solve the above-mentioned problems, the present invention is directed to a sphygmomanometer V which is attached to a human body blood pressure measurement site such as an upper arm, a wrist, or a finger, and is biased to an output shaft 2 of a motor 1. A diaphragm body 7 having a drive shaft 3 mounted centered, an operating rod 5 reciprocating in the motor radial direction by rotation of the drive shaft 3, and an air chamber 9 compressed and expanded by the operating rod 5 to perform a pumping action. And the operating rod 5
And a driving portion 7c for compressing and expanding the air chamber 9 by reciprocating motion of the operating rod 5 is provided on the diaphragm body 7, and a diaphragm portion 7 provided around the driving portion 7c is provided.
a, in the sphygmomanometer pump device in which only the surface facing the output shaft 2 of the motor 1 can be displaced, the exhaust valve 8 opens and closes the exhaust hole 8 b for exhausting the air in the air chamber 9 to the outside of the air chamber 9. The exhaust hole 8 b is connected to the connecting shaft 11 of the exhaust valve 11.
It is characterized by being arranged closer to the direction J in which the air chamber 9 is compressed than a.
When the air chamber 9 is compressed and the air in the air chamber 9 is exhausted to the outside of the air chamber 9 through the exhaust hole 8b, the exhaust hole 8b is arranged in the direction J in which the air chamber 9 is compressed. Therefore, the air in the air chamber 9 is smoothly exhausted from the exhaust hole 8b without being dispersed, and the efficiency of the air flow is extremely improved.

The exhaust hole 8b has a means for partially increasing the sectional area of the exhaust hole 8b at at least one of the end on the air chamber 9 side and the end on the side opposite to the air chamber 9. In this case, the cross-sectional area of the exhaust hole 8b increases on the end side of the exhaust hole 8b, so that air flows from the air chamber 9 into the exhaust hole 8b or from the inside of the exhaust hole 8b. The outflow of air to the outside of the air chamber 9 is performed more smoothly by means for partially increasing the cross-sectional area of the exhaust hole 8b.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below. The sphygmomanometer pump device P according to the present invention is used for a sphygmomanometer V such as an electronic sphygmomanometer that performs blood pressure measurement based on arterial pressure information of a human blood pressure measurement site such as an upper arm, a wrist, or a finger. As shown in FIG. 1 (b), the meter V includes a pump device P for a sphygmomanometer, a quick exhaust valve W and a constant speed exhaust valve X composed of an electromagnetic valve, a compression band Y, and a pressure sensor Z.
It is comprised as what provided with.

In FIG. 1 (a), 1 is a motor, 2 is an output shaft of the motor 1, 3 is a round-shaped drive shaft which is eccentrically attached to the output shaft 2 by welding or the like, and 4 is a motor. A motor mounting base having a through hole 4b through which the mounting screw 20 of the motor 1 is passed is provided near the center, and the motor mounting base 4 is provided at the outer peripheral corner with another member to be described later. And mounting holes for screwing.

Reference numeral 5 denotes a substantially rod-shaped operating rod, which is provided with a connecting hole 5a at the center thereof for connecting to the drive shaft 3, and a mounting member for connecting a diaphragm 7 described later to the operating rod 5 at both ends. A hole 5b is provided. Reference numeral 6 denotes a rectangular box-shaped case body having an open surface, four mounting holes provided in the outer corners, the opening surface is fitted with the motor mounting base 4, and the box bottom surface is a diaphragm body 7 described later. And an insertion hole 6a for inserting and holding the base 8 in the case body 6, and a ventilation hole 6b for guiding air introduced into the case body 6 to a suction valve 7e of a diaphragm body 7 described later. Is provided. Further, the case body 6 is provided with a suction port 6d for introducing external air into the case body 6. The suction port 6d has a crank shape bent in a horizontal sectional view as shown in a horizontal sectional view of FIG. A connection pipe portion 6e for connecting a pipe member 14 to be connected to the constant-speed exhaust valve X is connected to the case body 6.
Is provided.

Reference numeral 7 denotes a diaphragm body formed of an elastic body such as rubber and having a through hole 21 at one end through which a screw for mounting is passed. As shown in FIGS. On the diaphragm 7, a diaphragm portion 7 a having a slope and formed in a substantially rectangular oblique column shape extends three-dimensionally with respect to the plane of the diaphragm body 7, and is formed in a three-dimensional and integral one bag. A semicircular portion 7b serving as a bellows is provided on the top of 7a over the entire circumference. further,
A driving unit 7c for changing the volume in the diaphragm 7a to perform a pumping operation is provided at the center of the diaphragm 7a.
In order to increase the rigidity, a thick wall is formed from the bottom to the head of the diaphragm portion 7a and has the same height as the vertical surface. Further, a head 7d is provided at the tip of the driving unit 7c, penetrates through the mounting hole 5b of the operating rod 5 and protrudes and is attached to the rod surface, whereby the driving unit 7c is engaged and held by the operating rod 5. ing. 7e is a tongue-shaped suction valve integrally formed on the diaphragm body 7.

Reference numeral 8 denotes a rectangular base having mounting holes 22 at four corners, and an air chamber 9 is formed in a volume surrounded by the internal space of the diaphragm 7a and the base 8. The air chamber 9 is composed of an air chamber 9a on the outer side in the motor radial direction and an air chamber 9b on the inner side in the motor radial direction with respect to the driving section 7c. Since the diaphragm section 7a is formed to have a slope, the air chamber 9a The volume is larger than the volume of the air chamber 9b. On the side where the base 8 presses the diaphragm body 7, there is provided a substantially rectangular standing wall 10 having a shape substantially similar to the three-dimensional surface of the diaphragm portion 7 a, and the height of the standing wall 10 is parallel to the short axis of the base 8. And 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 slope walls connecting the two walls. A valve mounting hole 8 for mounting an exhaust valve 11 to be described later is formed on the base 8 surface in the upright wall 10.
a, and a single exhaust hole 8b having a relatively large sectional area, which will be described later, is provided on one side of the valve mounting hole 8a at a predetermined distance. Further, a groove-shaped suction passage 8c for guiding the air passing through the suction valve 7e to the air chamber 9 is provided. Further, a connection pipe portion 8d for connecting a pipe member 14 connected to the compression band Y is provided at an end of the base 8. The connecting pipe 8d is connected to a lid 12 to be described later.
It is in a state of communicating with an exhaust passage 17 formed between the base and the base 8. Further, the base 8 is provided with a communication pipe portion 8e which communicates with the connection pipe portion 6e of the case body 6.

As shown in FIGS. 7 to 9, the exhaust holes 8 b are provided one by one near the ends so as to be located at both ends of the base 8. The position of each exhaust hole 8b is the end on the side where the air chamber 9 is compressed, that is, it is provided so as to correspond to the side of the air chamber 9a. One exhaust hole 8b is formed at a position closer to the direction J in which the air chamber 9 is compressed than the valve mounting hole 8a where the 11a is mounted.

In the assembled state of the diaphragm, three out of four sides of the inner wall of the diaphragm portion 7a having a slope of the diaphragm body 7 and formed in a substantially rectangular oblique column shape, three of the four sides are the upright wall 10b of the base 8 and 10c, the diaphragm unit 7 is moved when the driving unit 7c moves.
a is prevented from moving inward and deforming. Also, of the outer peripheral surface of the diaphragm portion 7a, the same three sides as described above are configured to be in close contact with the inner peripheral surface of the insertion hole 6a of the case body 6, so that when the driving portion 7c moves, this diaphragm surface is moved. It is restricted from being displaced outward and expanded. Therefore, when the diaphragm portion 7a is driven by the operating rod 5, only the inclined driving portion 7c surface among the upright surfaces of the diaphragm portion 7a can vibrate, and the other surfaces are the case body 6 and the base 8 It is fixed without vibrating between the two.

Reference numeral 11 denotes an umbrella-type exhaust valve made of an elastic material such as rubber. The base member 8 is provided on the opposite side of the base 8 from the side in contact with the diaphragm 7 so as to correspond to each diaphragm 7.
One is to be attached. This exhaust valve 11 is shown in FIG.
As shown in the figure, an umbrella-shaped valve portion 11 is provided above the connecting shaft 11a.
The connecting shaft 11a is inserted and locked in a valve mounting hole 8a provided in the base 8, and the exhaust hole 8b is provided.
The valve 11b is arranged so as to cover b. The valve portion 11b of the exhaust valve 11 arranged so as to cover the exhaust hole 8b is normally closed so as to cover the exhaust hole 8b, and air in the air chamber 9 flows out from the exhaust hole 8b. When it comes, it is elastically deformed and the valve portion 11b
Is opened to exhaust air to the outside, and after exhaustion, returns to the closed state by elastic force. That is, the air flows only in one direction outside by the valve portion 11b, and the exhaust valve 11 prevents the air from returning to the inside of the exhaust hole 8b.

Further, the exhaust hole 8b which can be opened and closed by the valve portion 11b of the exhaust valve 11 is moved closer to the direction J in which the air chamber 9 is compressed than the valve mounting hole 8a where the connecting shaft 11a of the exhaust valve 11 is mounted. One is formed at the position. This exhaust hole 8b
As shown in FIG. 2, FIG. 3, and FIG. 6, the hole diameter of the hole from the end on the air chamber 9 side (the lower side in FIG.
Is formed in a tapered shape in which the diameter of the hole gradually increases toward the end portion (above). The diameter of the exhaust hole 8b is within a range that can be freely opened and closed by the valve portion 11b of the exhaust valve 11. The diameter is formed larger than the exhaust hole.

Reference numeral 12 denotes a lid having mounting holes 23 at the four corners of the outer edge, and a recess 12 partially recessed inward on the outer surface.
a is provided, and when the lid 12 is attached to the base 8, an exhaust path 17 is formed between the base 8 and the lid 12 by the recess 12 a. A connection pipe portion 12b to which a pipe member 14 to be connected to the rapid exhaust valve W is connected from the lid 12 so as to communicate with the exhaust path 17.
Is protruding. An exhaust passage 17 formed between the base 8 and the lid 12 communicates with a connecting pipe 8e provided in the base 8, and the exhaust passage 17 is connected to the connecting pipe 8e via the connecting pipe 8e. 6e.

Reference numeral 13 denotes a mounting screw for penetrating through the motor mounting base 4, the case body 6, the diaphragm body 7, the base 8 and the lid 12 and integrally fixing the same. 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 operating rod 5 makes a circular motion in a plane perpendicular to the output shaft 2 of the motor 1 and the drive unit 7c of the diaphragm unit 7a The same circular motion as the operation rod 5 is performed. At this time, as viewed from the output shaft 2 of the motor 1, a step of increasing the distance from the tip of the operating rod 5 (half a circumference of the circular motion), that is, the tip of the operating rod 5 is moved radially outward with respect to the output shaft 2. When the movement is performed, the driving portion 7c is similarly displaced radially outward, and since the volume of the air chamber 9 is configured to be displaceable only on the inclined surface of the diaphragm, the air chamber 9a is compressed. The volume decreases, while the air chamber 9b is expanded and the volume increases, but the volume of the air chamber 9a is larger than that of the air chamber 9b.
, The volume of the air chamber 9 is reduced as a whole. Next, the step of reducing the distance between the tip of the operating rod 5 and the output shaft 2 of the motor 1 (the remaining half of the circular motion), that is, the operating rod 5 moves so as to approach the output shaft 2 radially inward. At that time, the drive unit 7c is also displaced radially inward, and the volume of the air chamber 9 is increased as a whole.

In the step of reducing the volume of the air chamber 9, the pressure of the air chamber 9 is increased, the suction valve 7e is pressed against the case body 6 and closed, and conversely, the exhaust valve 11 is opened and one point in FIG. Air is supplied to the connection pipe 8e through the exhaust path 17 as indicated by a chain line arrow. Next, in the step of increasing the volume of the air chamber 9, the air chamber 9 is decompressed and the suction valve 7e is opened, and the air that has entered the case body 6 from the suction port 6d as shown by the dashed arrow in FIG. The air flows into the air chamber 9 through the ventilation port 6b and the suction passage 8c to perform a suction operation. On the contrary, the exhaust valve 11 is reliably closed by the internal pressure acting. Since the air chambers 9 are installed 180 degrees apart from each other and located in opposite positions, the steps of suction and compression of both are just reversed, and when one air chamber 9 is sucking air, the other air The chamber 9 performs an operation of compressing air. Further, each air chamber 9 performs one pumping operation with one rotation of the drive shaft 3, but is performed twice as a whole,
Moreover, since the phase of the discharged air differs by 180 degrees between the air chambers 9, the pulsation of the air discharged from the connection pipe portion 8d is reduced as compared with a pump having one air chamber 9.

In performing the blood pressure measurement, constant-speed exhaust is performed via the connection pipe 8e, the exhaust path 17, the communication pipe 8e, the connection pipe 6e, and the constant-speed exhaust valve X.
After the blood pressure measurement, rapid exhaust is performed via the connection pipe 8e, the exhaust path 17, the connection pipe 12b, and the quick exhaust valve W. In supplying the air into the compression band Y, the air in the air chamber 9 is sequentially discharged into the exhaust path 17 via the exhaust valve 11, and the air is supplied into the compression band Y via the connection pipe 8e. At this time, air flows only in one direction outside by the valve portion 11b, and the exhaust valve 11 prevents air from returning to the inside of the exhaust hole 8b. The base 8 on which the connecting shaft 11a of the exhaust valve 11 is attached
Is provided with an exhaust hole 8b adjacent to the valve mounting hole 8a.
a, 9b are arranged in the direction J for compressing them. That is, the direction J of compressing the air chamber 9 located on the left side in FIG. Two exhaust holes 8b are formed,
On the other hand, the direction J in which the air chamber 9 located on the right side is compressed is directed rightward, and one exhaust hole is located closer to the right side than the valve mounting hole 8a where the connecting shaft 11a of the exhaust valve 11 corresponding to this air chamber 9 is mounted. 8b are formed, and the air chamber 9 and the exhaust path 17 communicate with each other through each of the exhaust holes 8b.

As described above, the exhaust holes 8b are arranged closer to the direction J in which the air chamber 9 is compressed than the connecting shaft 11a of the exhaust valve 11, so that the exhaust holes are formed on the outer periphery of the valve mounting hole 8a in the conventional manner. Unlike the case where 8b is provided, the air is exhausted without being dispersed. Therefore, the valve 1
When the valve 1b is opened, the efficiency of the air flow from the exhaust hole 8b into the compression band Y via the exhaust path 17 becomes extremely high, and as a result, the maximum pressure value of the pump can be improved. According to the experiment of the present inventor, it was confirmed that when a single exhaust hole 8b was provided on the compression side of the air chamber 9, the maximum pressure value of the pump could be further improved by 30 mmHg from the current state. It is to be noted that the present invention is not limited to the case where a single exhaust hole 8b is provided, and a plurality of exhaust holes 8b may be provided on the compression side of the air chamber 9. In this case, the efficiency of fluid flow can be further improved. understood.

FIG. 11 shows another embodiment of the present invention in which means for partially increasing the sectional area of the exhaust hole is provided. FIG. 11A shows the exhaust path 17 of the exhaust hole 8b.
FIG. 11B shows a case where an expanded inclined surface 35 is formed at the end on the side of FIG. 11, and FIG. 11B shows a case where an expanded inclined surface 35 is formed at the end of the exhaust hole 8b on the air chamber 9 side. In each case, the cross-sectional area of the exhaust hole b can be partially increased, so that the air flows from the air chamber 9 into the exhaust hole 8b and from the exhaust hole 8b to the exhaust path 17. The efficiency of the air flow can be further improved. Further, as shown in FIG. 11C, an inclined surface 35 having an expanded shape may be formed at both the end on the air chamber 9 side and the end on the exhaust passage 17 side of the exhaust hole 8b. Further, the cross-sectional shape is not limited to the inclination, and may be, for example, a round cross-sectional shape. In short, any cross-sectional shape that partially increases the cross-sectional area of the exhaust hole 8b may be used.

[0023]

As described above, the invention according to claim 1 of the present invention is connected to a sphygmomanometer mounted on a human body blood pressure measurement site such as an upper arm, a wrist, or a finger, and is eccentric to an output shaft of a motor. A drive shaft to be mounted, an operating rod that reciprocates in the motor radial direction by rotation of the drive shaft, and a diaphragm body having an air chamber that is compressed and expanded by the operating rod to perform a pumping operation, and is connected to the operating rod. The diaphragm is provided with a drive unit that compresses and expands the air chamber by the reciprocating motion of the operating rod, and only the surface of the diaphragm unit around the drive unit that faces the output shaft of the motor can be displaced. Sphygmomanometer pump device
An exhaust hole for exhausting air in the air chamber to the outside of the air chamber is freely opened and closed by an exhaust valve, and the exhaust hole is arranged closer to a direction in which the air chamber is compressed than a connection shaft of the exhaust valve. When the air in the air chamber is exhausted to the outside of the air chamber through the exhaust holes, the exhaust holes are arranged in the direction in which the air chamber is compressed, so that the air in the air chamber is not dispersed. , The efficiency of the air flow becomes extremely high, and as a result, the maximum pressure value of the sphygmomanometer pump device can be improved.

According to a second aspect of the present invention, the exhaust hole according to the first aspect has a cross-sectional area of at least one of an end on the air chamber side and an end on the opposite side to the air chamber. In addition to the effect of claim 1, since the cross-sectional area of the exhaust hole increases on the end side of the exhaust hole, air from the air chamber to the inside of the exhaust hole is provided. The inflow of air or the outflow of air from the inside of the exhaust hole to the outside of the air chamber is performed more smoothly by means for partially increasing the cross-sectional area of the exhaust hole, and the maximum pressure value of the blood pressure monitor pump device can be further improved. You can do it.

[Brief description of the drawings]

1A is a cross-sectional view illustrating an example of the present invention, FIG. 1B is an explanatory view illustrating a schematic configuration of a sphygmomanometer, and FIG. 1C is a partial horizontal cross-sectional view illustrating an inlet.

FIG. 2 is a partially enlarged view of a portion shown in FIG.

FIG. 3 is a partially enlarged view of an e-portion in FIG.

4A and 4B show the same diaphragm body, wherein FIG. 4A is a plan view, FIG. 4B is a side view, and FIG. 4C is a bottom view.

5A is a cross-sectional view taken along the line BCDDE in FIG. 4A, and FIG. 5B is a cross-sectional view taken along the line FGHI in FIG. 4A.

FIG. 6 is a cross-sectional view showing the base of the above.

FIG. 7 is a plan view showing the base according to the embodiment.

FIG. 8 is a bottom view showing the base.

FIG. 9 is a side view showing the base of the above.

FIG. 10A is a partially enlarged view of a part G in FIG. 8;
(B) is a sectional view.

FIGS. 11A to 11C are cross-sectional views of another embodiment.

FIG. 12 is a sectional view showing a conventional example.

FIG. 13 is an explanatory diagram for explaining a conventional arrangement state of exhaust holes.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Output shaft 3 Drive shaft 5 Operating rod 7 Diaphragm body 7b Diaphragm part 8b Exhaust hole 9 Air chamber 11 Exhaust valve 11a Connecting shaft

Claims (2)

[Claims] 1. A drive shaft connected to a sphygmomanometer to be mounted on a human body blood pressure measurement site such as an upper arm, a wrist, or a finger, and reciprocating in a radial direction of the motor by rotation of the drive shaft. A drive body comprising a working rod and a diaphragm body having an air chamber which is compressed / expanded by the working rod to perform a pumping operation, and which is connected to the working rod and compresses / expands the air chamber by reciprocating movement of the working rod. In a sphygmomanometer pump device in which a portion is provided on a diaphragm body and only a surface of a diaphragm portion provided around a driving portion that is opposed to an output shaft of a motor can be displaced, air in an air chamber is exhausted out of the air chamber. A pump device for a sphygmomanometer, characterized in that the exhaust hole to be opened and closed is freely opened and closed by an exhaust valve, and the exhaust hole is arranged closer to the direction of compressing the air chamber than the connecting shaft of the exhaust valve. 2. The exhaust hole is provided with means for partially increasing the cross-sectional area of the exhaust hole at at least one of the end on the air chamber side and the end on the side opposite to the air chamber. The pump device for a sphygmomanometer according to claim 1, wherein: