JP2784040B2 - Quick exhaust valve for sphygmomanometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a quick exhaust valve used in a sphygmomanometer.

[Prior art]

In a sphygmomanometer (electronic sphygmomanometer), after the cuff is pressurized, the maximum and minimum blood pressure value and pulse rate are measured while gradually evacuating, and then the pressurized air remaining in the cuff is rapidly discharged from the quick exhaust valve. In addition to the solenoid valve, the quick exhaust valve comes into contact with a rubber cylindrical body 2 disposed at an exhaust port and an end face of the cylindrical body 2 as shown in FIGS. Thus, a valve lid 3 for closing the exhaust port is provided. The valve cover 3 is made of a magnetic material, is rotatably supported by a shaft 6, and has a torsion coil mounted on an output shaft of a motor 5 for driving a diaphragm pump for sending pressurized air to a cuff. It is driven by a spring 7. That is, when the motor 5 rotates in the direction indicated by A in FIG. 6 to drive the diaphragm pump 1 through the crank portions 12 and 13, the torsion coil spring 7 engages the valve cover 3 with one end piece 7b. The joint piece 9 is pressed, the valve cover 3 is turned, and the exhaust port is closed by bringing the exhaust port into contact with the distal end surface of the cylindrical body 2 where the exhaust port is opened. After the exhaust port is closed by the valve cover 2, the torsion coil spring 7 idles with respect to the output shaft of the motor 5, so that the driving of the diaphragm pump 1 does not interfere. For rapid exhaust, the motor 5 may be rotated in the reverse direction, that is, in the direction B in the drawing. With this rotation, the other end 7a of the torsion coil spring 7 presses and rotates the engagement piece 8 of the valve cover 3, so that the valve cover 3 separates from the cylindrical body 2 and opens the exhaust port. In this apparatus, a pair of permanent magnets 21 and 22 for attracting the tip end of the valve lid 3 are provided in order to maintain a state where the exhaust port is closed by the valve lid 3 and a state where the exhaust port is opened. It has become. In the figure, 18 is an intake port, 15 is an air supply port for sending air to the cuff, and the exhaust port is an air supply port
It is formed as communicating with 15.

[Problems to be solved by the invention]

Although the outer diameter of the rubber cylindrical body 2 provided with the exhaust port is slightly smaller than the outer diameter of the distal end side compared to the root side, the difference between the root side and the distal end side is almost the same from the viewpoint of the elastic coefficient. Not
Since it has a considerably large elastic coefficient, required performance can be obtained if there is any deviation between the height of the permanent magnet 21 and the height of the cylindrical body 2 due to a dimensional error of each part or an error at the time of assembly. Have the problem of not being able to do so. That is, as shown in FIG. 8, if the permanent magnet 21 is higher, the valve lid 3 does not adhere to the upper surface of the cylindrical body 2 and air leakage occurs, and conversely, as shown in FIG. As described above, if the permanent magnet 21 is lower, the valve lid 3 is attracted to the permanent magnet 21 in a state where the cylinder 2 is compressed. However, since the force required for this compression is large, the valve by the permanent magnet 21 is Since the attraction force of the lid 3 is weakened, the valve lid 3 is often separated from the cylindrical body 2 due to vibration or shock, causing air leakage. The present invention has been made in view of such a point, and an object of the present invention is to ensure a reliable operation even when a part size, an error at the time of assembling, or a slight change in the hardness of a rubber cylindrical body. It is to provide a quick exhaust valve for a blood pressure monitor which can be obtained.

[Means for Solving the Problems]

Thus, the present invention provides a rapid exhaust valve comprising a rubber cylinder disposed at an exhaust port and a valve lid that closes the exhaust port by contacting the distal end surface of the cylinder, wherein the valve lid of the cylinder contacts the The characteristic feature is that the elastic modulus of the leading end portion is smaller than that of the other portions. [Operation] According to the present invention, since the distal end portion of the cylindrical body is easily deformed, the valve lid may be driven in a manner that allows for this deformation.
Further, even if the compression amount of the cylinder changes due to a dimensional error or the like, the change in the force required to hold the valve lid is small. [Embodiment] The present invention will be described below in detail with reference to an embodiment shown in the drawings. The quick exhaust valve here has the same configuration as that of the above-mentioned conventional example, but a rubber cylinder disposed at the exhaust port 2 is the one shown in FIG. As is clear from the drawing, this cylindrical body 2 has an easily deformable portion 20 whose distal end portion is formed to have a small thickness over a required length and whose elastic modulus is considerably smaller than that of other portions. The height h is larger than that of the conventional example. When such a cylindrical body 2 is used, as shown in FIG. 2, the upper end of the cylindrical body 2 and the upper end of the permanent magnet 21 are located at a higher position even if there is a dimensional error or the like. When the exhaust port is kept closed by the valve cover 3 being in contact with the upper end surface of the cylinder 2 and being attracted to the permanent magnet 21, the easily deformable portion 20 of the cylinder 2 is compressed. It will be in the state that was done. The dimensional error and the like appear as a change in the amount of compression of the cylinder 2, but it is the easily deformable portion 20 that is compressed, and even if the amount of compression is different, the force required for compression hardly changes. The valve lid 3 is securely held by the magnet 21 so that the valve lid 3 does not separate from the cylinder 2 due to shock or vibration, and the easily deformable portion 20 of the cylinder 2 becomes thin. However, since the contact area with the valve lid 3 is increased by being compressed, air leakage does not occur. However, if the thickness of the easily deformable portion 20 is too small, the pressurized air may deform the easily deformable portion 20 under its own pressure and leak out. As shown, by forming the annular V-shaped groove 23 on the tip end surface, it is possible to cope with this by making the easily deformable portion 20 a double structure of the inner peripheral side and the outer peripheral side. Particularly, in order to increase the contact area with the valve cover 3, as shown in FIG.
It is preferable to form a hollow portion 24 in the inside.

【The invention's effect】

As described above, in the present invention, since the distal end portion of the cylindrical body with which the valve lid comes into contact is easily deformed, the valve lid may be driven in a form that allows for this deformation,
Further, even if the compression amount of the cylinder changes due to a dimensional error or the like, the change in the force required to hold the valve lid is small, so that the exhaust port can be reliably closed by the valve lid. Therefore, air leakage does not occur.

[Brief description of the drawings]

1 (a) and 1 (b) are a plan view and a cutaway front view of a tubular body according to an embodiment of the present invention, FIGS. 2 (a) and 2 (b) are operation explanatory views of the same, and FIGS. FIG. 4B is a plan view and a cutaway front view of another embodiment of the tubular body, FIGS. 4A and 4B are a plan view and a cutaway front view of still another embodiment of the tubular body, and FIG. FIG. 6 is a perspective view of an example of the valve, FIG. 6 is a cross-sectional view of the same, FIGS. 7 (a) and 7 (b) are cross-sectional views showing the operation of the same, and FIGS. In the figure, 2 is a cylinder, 3 is a valve lid, 20
Indicates an easily deformable portion.

Claims (1)

(57) [Claims] 1. A rapid exhaust valve comprising a rubber cylinder disposed at an exhaust port, and a valve cover for closing an exhaust port by contacting a tip end surface of the cylinder, wherein the valve lid of the cylinder is provided. A quick exhaust valve for a sphygmomanometer, wherein an elastic coefficient of a contact end portion is smaller than that of another portion.