JPH0238772A - Exhaust valve device - Google Patents

Abstract

PURPOSE:To stabilize the performance with respect to temperature and aging fluctuations and to simplify the manufacture, in a constant velocity exhaust valve device, by reducing the inner dia. of a valve body near the bottom gradually. CONSTITUTION:The inner dia. of a valve body 4 near the bottom is reduced gradually, whereby it is possible to form a governing body 7 of a simple straight rod or the like and to enable the manufacture with a metal material easily. The valve seat 4 needs resiliency, but a material such as silicon rubber or the like having less fluctuation in size against temp. change may be used, so that it is possible to obtain a stable exhaust property with respect to temp. change. Further a metal material may be used for a governing body 7, and thereby it is possible to obtain stable exhaust performance even with respect to aging change.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an exhaust valve device used in a blood pressure monitor or the like to perform constant-speed exhaust.

[Conventional technology]

With a blood pressure monitor, it is necessary to gradually filter out the pressurizing force by evacuating at a constant rate through a bag-like cuff that is wrapped around the arm. As an exhaust valve device used for this purpose, the conventional Japanese Utility Model Publication No. 59-27582
There is something shown in the publication.

This exhaust valve device has a bottomed cylindrical valve body made of an elastic material with a slit, and by inserting a Taber rod-shaped adjustment body into the valve body, the valve body is pushed out from inside and the opening area of the slit is changed. It is something.

By changing the opening area of the slit in this way, the exhaust speed can be adjusted. The adjustment body is adjusted to advance or retreat by means of a neck portion provided at the base end.

[Problem to be solved by the invention]

It is preferable that the adjustment body is made of a metal material from the viewpoint of taste and the like. However, making the adjusting body made of metal, which is a barbed body having a tapered rod, requires complicated processing and increases the manufacturing cost.

If the adjustment body is made of a resin molded product, manufacturing will be simple and cost-effective. However, in the case of resin molded products, the dimensions change significantly due to temperature changes. Therefore, there is a problem in that the adjustment characteristics of the pressurizing force of the cuff changes depending on the temperature, and accurate measurement cannot be performed in blood pressure measurement that requires very delicate adjustment.

Furthermore, when the adjusting body is a resin molded product, there is a problem that the adjustment characteristics of the pressing force tend to change due to changes over time.

An object of the present invention is to provide an exhaust valve device that is stable against temperature changes and changes over time and is easy to manufacture.

[Means to solve the problem]

The exhaust valve device of the present invention provides a slit in a bottomed cylindrical valve body made of an elastic material, and adjusts the opening area of the slit by inserting an adjusting body into the valve body and pushing the valve body apart. In this device, the inner diameter of the valve body decreases as it approaches the bottom.

[Effect]

According to the exhaust valve device of the present invention, since the inner diameter of the valve body decreases as it approaches the bottom, the amount by which the valve body is pushed out is adjusted by the amount of insertion of the regulating body into the valve body, and the opening area of the slit is adjusted. be able to. For this reason, the adjusting body may be a straight bar-shaped body and can be easily manufactured from a metal material. The valve body can be made of a material such as silicone rubber that exhibits little dimensional change due to temperature changes.

〔Example〕

A first embodiment of the present invention will be described based on FIGS. 1 to 4.

The valve body 1 is formed in the shape of a stepped cylinder with a bottom, and a female threaded portion 2 is formed on the inner surface of the large diameter portion on the opening side. Valve body 1
The bottom plate is provided with a connection port 3 for connecting to the cuff of the blood pressure monitor and the pump. The valve body 4 is made of an elastic material such as silicone rubber and has a cylindrical shape with a bottom, and is provided with a slit 5 along the axial direction in a part of its circumferential surface. The inner diameter and outer diameter of the valve body 4 are:
It decreases as it approaches the bottom. The valve body 4 is attached to the valve body 1 by providing a flange portion 4a on the periphery of the opening and sandwiching the flange portion 4a between the stepped portion 1a of the valve body 1 and a ring-shaped valve fitting 6. The valve fitting 6 is press-fitted into the inner surface of the valve body 1.

The shaft portion 7a of the regulating body 7 is inserted into the valve body 4.

The adjusting body 7 consists of a male threaded part 7b screwed into the female threaded part 2 of the valve body 1, and a shaft part 7a protruding from one side of the male threaded part 7b, and has an exhaust hole 8 formed in the center thereof. The exhaust hole 8 is open to the atmosphere.

FIG. 3 shows a blood pressure needle using this exhaust valve device.

This exhaust valve device EA is attached to the side plate portion of the main body case 10, and its connection port 3 is connected to the rubber hose 11.

The rubber hose 11 is branched and connected to a pump 12 and a bag-shaped arm IF13.

The operation of the above configuration will be explained. When measuring blood pressure, the cuff 13 is wrapped around the arm, and the pump 12 supplies air until the pressure inside the cuff 13 reaches a predetermined pressure. When the predetermined pressure is reached, the pump 12 is stopped. The air in the arm cuff 13 is exhausted from the exhaust valve device A at a constant speed, and the pressurizing force on the arm cuff 13 is gradually reduced. In this state, the pulse of the arm is detected by a detection means (not shown), and the blood pressure is measured.

The exhaust valve system WA sets the exhaust speed to a predetermined speed by adjusting the screwing amount of the regulator 7. When the regulator 7 is pulled out to the extent that it does not hit the inner surface of the valve body 4, The slit 5 is closed as shown in FIG. 2(A). 411
When the one body 7 is screwed in along the female threaded part 2, the valve body 4 is pushed wide by the shaft part 7a of the regulating body 7, and the slit 5 is opened. The air is exhausted through the exhaust hole 8. In this case, even if the pushing amount of the adjusting body 7 is the same, the opening area of the slit 5 changes depending on the pressure in the valve chamber 9 in the valve body 1.

In the case of low pressure, the slit 5 opens wide as shown in Fig. 2(B), but in the case of high pressure, the valve body 4 is pushed from the outside by pressurized gas, so the slit 5 opens as shown in Fig. 2(C). The opening area becomes smaller. When the pressure is high, even if the opening area is the same, evacuation is easier than when the pressure is low, so by changing the opening area of the slit 5 according to the pressure in this way, it can be used regardless of pressure changes in the valve chamber 9. , substantially constant and stable constant speed exhaust is performed.

FIG. 4 shows the arm cuff 13 when exhausting air with this exhaust valve device 1A.
Pump 1 along the zero curve section p showing the pressure-time characteristic within
2, the pressure is increased to a predetermined initial setting pressure, and by stopping the pump 12, the pressure is reduced at a constant speed as shown by curved portion q.

The initial set pressure is typically 150-250 wsHg.

In this exhaust valve device A, the inner diameter of the valve body 4 decreases as it approaches the bottom, so the shaft portion 7a of the regulating body 7 may have a simple shape such as a straight rod shape, and the Uj4 joint body 7 is made of metal. Easy to manufacture with materials. Further, although the valve body 4 is elastic, a material such as silicone rubber that is less likely to change in dimensions due to temperature changes can be used. Therefore, unlike the case where a resin molded product is used for the regulator 7, stable exhaust characteristics against temperature changes can be obtained. Furthermore, since a metal material can be used for the regulator 7, stable exhaust characteristics can be obtained even with respect to changes over time.

5 and 6 show a second embodiment. This example:
A slit 5 is provided on the bottom surface of the valve body 4', and the wall thickness of the valve body 4' is varied so that only the inner diameter decreases as it approaches the bottom.

Also in this configuration, constant speed exhaust is performed in the same manner as described above, and the same effects as described above can be obtained. Figure 6 (A
) shows the non-pushing state, FIG. 6(B) shows the case when the pressure in the valve chamber 9 is low, and FIG. 6(C) shows the case when the pressure is high.Other configuration effects are the same as in the first embodiment. It is.

FIGS. 7 and 8 show a third embodiment. This example:
The inner diameter of the valve body 4'' is formed so as to decrease stepwise toward the bottom, and a slit 5 is provided at the bottom.

When configured in this way, the opening area of the slit 5 changes digitally by pushing the tip of the shaft portion 7a of the regulating body 7 into each step portion a-c of the valve body 4″.
Easy to adjust. Figure 8 (A) shows the unstretched state, (B
) indicates a low pressure state, and (C) indicates a high pressure state.Other structural effects are the same as in the first embodiment.

〔Effect of the invention〕

In the exhaust valve device of the present invention, since the inner diameter of the valve body decreases as it approaches the bottom, the regulating body may have a simple shape such as a straight rod shape, and can be easily manufactured from a metal material.

Further, although the valve body has elasticity, it is possible to use a material such as silicone rubber that has little dimensional change due to temperature changes. Therefore, stable exhaust characteristics against temperature changes can be obtained. Further, since a metal material can be used for the regulator, there is an effect that stable exhaust characteristics can be obtained even with changes over time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the first embodiment of the present invention, and FIG. 2 (A
) to (C) are explanatory diagrams of their operations, FIG. 3 is a cutaway perspective view of a blood pressure monitor using the exhaust valve device of the same embodiment, FIG. 4 is an explanatory diagram of its pressure-time characteristics, and FIG. 5 is a diagram illustrating its pressure-time characteristics. A sectional view of the second embodiment, FIGS. 6(A) to 6(C) are operation explanatory diagrams showing the cross section and the front side of the valve body, FIG. 7 is a sectional view of the third embodiment, and FIG. A) to (C) are operation explanatory diagrams showing the cross section and the front side of the valve body, respectively. ■... Valve body, 2... Female threaded part, 3... Connection port,
4...Valve body, 4', 4''...Valve body, 5...Slit, 7...Adjusting body, 7a...Shaft part, 7b...Male thread part, 8...Exhaust Hole 1 (A) (B) (C) = 2 (A) (C) -485=

Claims (1)

[Claims] A valve body formed in the shape of a cylinder with a bottom and made of an elastic material and having a slit penetrating inside and outside, and a valve body that is inserted into the valve body from an opening at one end so as to be movable in the axial direction to spread the valve body and increase the opening area of the slit. What is claimed is: 1. An exhaust valve device comprising a regulating body for adjusting the exhaust valve, wherein the inner diameter of the valve body decreases as it approaches the bottom.