JP2002276839A - Air valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air valve in which a consumption power is also made to a less value using a small size of box. SOLUTION: The air valve is provided with a hollow cylindrical part 4 connected to a storage part 1 of a pressurized gas and having an opening 6 at the other end; and a cylindrical slider 5 opposed to the opening 6. In the air valve, the slider is driven so as to closely contact with the opening 6 when the slider 5 is magnetized and the air valve is constituted by the opening 6 and a sealing part (packing) 8 opposed to the opening 6. At the time, a bottom part (cap) 11 of the slider 5 is formed by a bottom part including an exhaust port 15 and the box 2 and the slider 5 are joined to each other through the bottom part 11 by a closed magnetic circuit member 14 (shaft body). A flange part 16 and a projection 17 are provided between the cylindrical part 4 and the box 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air valve for opening and closing an opening in a cylindrical portion connected to a gas storing portion to change the gas pressure.

[0002]

2. Description of the Related Art Conventionally, an exhaust valve used in a portable sphygmomanometer has a configuration shown in a vertical sectional view of FIG. In FIG. 2, the gas storage unit 1 merely shows the connection position. The exhaust valve connected to the storage unit 1 controls the opening and closing of the valve to make the pressure of the pressurized gas variable. The housing 2 shown in FIG. 2 shows the entire configuration of the exhaust valve, and the outside of the housing 2 is shown as a yoke 3. That is, the yoke 3 is made of a magnetic material.
The components built in are a cylindrical portion 4 and a slider 5.

[0003] The cylindrical portion 4 is made of a magnetic material and is hollow. A slider 5 is provided to face the opening 6 of the hollow cylindrical portion 4 opposite to the storage portion 1. The slider 5 is provided with an opening 6 of the cylindrical portion 4 by a magnetized coil 7.
It can be moved to the right until it comes into close contact with. In the slider 5, a packing 8 as a sealing portion is provided at a position facing the opening 6. The side opposite to the packing 8 of the slider 5 is hollow as shown in the figure.

The coil 7 is wound around a coil bobbin 9 between the cylindrical portion 4 and the slider 5, and is excited by electric power from a DC power supply (not shown) and is switched to non-excitation.
A spring coil 10 is wound around a portion of the cylindrical portion 4 near the slider 5 side end and a portion of the slider 5 near the opening 6 of the cylindrical portion 4. A cover 11 for the yoke 3 is provided on the opposite side of the opening 6 of the cylinder upper part 4, and a coil bobbin 9 protrudes outward at a central portion thereof. The lid 11 is provided together with the coil bobbin 9 in order to prevent the slider 5 from falling off on the side opposite to the cylindrical portion 4.

The operation of the exhaust valve shown in FIG. 2 will be described. At the position of the slider 5 with respect to the cylindrical portion 4 shown in FIG.
Is exhausted from an exhaust port provided on the left side of the slider 5. Therefore, the gas pressure in the storage unit 1 is the lowest.

Next, when the coil 7 is excited, the slider 5 is driven rightward in FIG. 2 and moves while pressing the spring coil 10 until the packing 8 comes into close contact with the opening 6.
In this state, the packing 8 closes the opening, and the gas in the storage unit 1 is closed.

The gas closed in the storage section 1 is subjected to a predetermined processing operation such as pressurization. When the energization of the coil 7 is interrupted, the slider 5 moves leftward in FIG. 1 by the repulsive force of the spring coil 10 and stops at the position shown in FIG. Since the packing 8 creates a gap with the opening 6, the gas in the storage section 1 is exhausted through the periphery of the slider 5,
The gas pressure in the storage 1 decreases.

[0008]

However, when the housing 2 shown in FIG. 2 is operated as an exhaust valve so as to control the gas pressure in the storage unit 1, there is a problem in miniaturization and power saving as the valve. There is. When the coil 7 is excited as described above, the lines of magnetic force generated by the coil 7 enter the cylindrical portion 4, the cylindrical portion 4 → the gap 12 near the opening 6 → the slider 5 →
Gap 13 of coil bobbin 9 at bottom of slider → yoke 3
→ It passes through the cylindrical part 4. Normally, the material of the coil bobbin 9 is a synthetic resin, and the size of the gap 13 is smaller than the gap 12 by a fraction. This means that a large magnetic resistance is applied to the magnetic field lines from slider to slider.

When the conventional coil bobbin 9 is manufactured, the material thereof is often a synthetic resin. Therefore, when reducing the size of the entire air valve, the gap 12 can be set to a small value.
It is difficult to set 13 to a small value in terms of the surrounding material and strength. Therefore, when you want to reduce the size,
Since the value of 13 remains as a relatively large value, it cannot meet the demand for miniaturization. Therefore, the magnetoresistance cannot be made extremely small. Further, in order to obtain an appropriate driving force for the slider, a large power consumption is required.

The present invention has been conceived in order to solve the above-mentioned problem, and has as its object to provide a slider for an air valve using a miniaturized housing and using a small amount of power. .

[0011]

According to the present invention, there is provided an air valve, comprising: a hollow cylindrical portion connected to a gas storage portion and made of a magnetic material having an opening at the other end; Wherein the slider and the cylindrical portion are magnetized by a coil, are movable until the slider comes into close contact with the opening of the cylindrical portion, and a sealing portion is provided facing the opening. .

The outer periphery of the cylindrical portion made of the magnetic material forms a casing made of a magnetic material via a coil bobbin and a coil, and is provided between the casing and the peripheral edge of the slider. The air gap provided in the opening serves as an exhaust portion for exhausting the gas flowing out from the opening of the cylindrical portion.

In this air valve, an exhaust port provided at the rear end of the slider is formed at the bottom of the casing, and the casing and the slider are joined to each other by a closed magnetic path member via the bottom.
Further, a tip at which the cylindrical portion is connected to the gas storage portion includes a flange portion that is in close contact with the housing and protrudes in an outer peripheral direction of the housing, and the housing includes a protrusion in the slider operation direction. It is characterized by the following.

According to this configuration, when a current is applied to the coil, a driving force with a low magnetic resistance is applied to the slider. The power is small. If the same amount of power is used as in the prior art, the value of the gap can be reduced, that is, the entire housing can be reduced in size.

Further, in the air valve according to the present invention, the closed magnetic path member has a shape of a shaft inserted into the cylindrical slider, and the length of the shaft is shorter than the shaft length of the slider. It is characterized by having been set.

With this configuration, even if the inserted shaft body is relatively small, it is effective to reduce the power consumption and downsize the housing.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a longitudinal sectional view showing the configuration of the embodiment of the present invention.

In FIG. 1, a casing 2 means an entire configuration including a yoke 3, a cylindrical portion 4, a coil 7, a coil bobbin 9, and a slider 5. The shaft body 14 serving as a closed magnetic circuit member includes:
The slider 5 is inserted into the center of the slider 5 in the direction of the packing 8 from the side opposite to the packing 8. The length of the shaft body 14 in the shaft length direction is shorter than the shaft length direction of the slider 5, and in FIG. 1 is set shorter than the length of the insertion hole provided in the slider 5. The other end of the shaft 14 is joined to the lid 11 for the yoke 3.

Next, the yoke 3 has a special structure at a connection portion with the cylindrical portion 4. That is, the flange 16 and the projection 17
And The flange 16 protrudes in the direction of the yoke 3 at the tip where the tubular portion 4 is connected to the pressurized gas storage 1. protrusion
Reference numeral 17 denotes a shape in which the yoke 3 surrounds the cylindrical portion 4 and protrudes toward the pressurized gas storage portion 4.

It is necessary to provide a plurality of exhaust ports 15 in the lid 11, and two exhaust ports 15 are provided in FIG. The storage unit 1, the yoke 3, the opening 6, the coil 7, and the coil bobbin 9 as other components are the same as those shown in FIG.

Next, the operation of the air valve shown in FIG. 1 will be described. At the position of the slider 5 shown in FIG. 1, since the opening 6 is separated from the packing 8, the pressurized gas in the storage unit 1 is exhausted, and the gas pressure is the lowest. When power from a DC power supply is applied to the coil 7, the slider 5 moves rightward while shifting the position relative to the shaft 14. Since the packing 8 of the slider 5 is in close contact with the opening 6 of the cylindrical portion 4, the gas in the storage unit 1 can be subjected to a process such as pressurization.

At this time, the path of the magnetic force lines generated by the coil 7 is as follows: the slider 5 → the shaft 14 → the lid 11 → the yoke 3 → the cylindrical portion 4.
→ Gap 12 → Passes through slider 5. Therefore, only the gap 12 is a portion that becomes a magnetic resistance to the magnetic force lines.
In addition, there is a difference between the yoke 3 and the cylindrical portion 4 from the conventional one. That is, the cylindrical portion 4 serves as a connection portion with the yoke 3.
Both the flange 16 and the protrusion 17 are formed. Therefore, at this point, it can be said that the cylindrical portion 4 and the yoke 3 are in surface contact, and it is clear that the magnetic resistance is reduced.

When the application of the electric power to the coil 7 is completed and the direct current is cut off, the driving force for the slider 5 is lost, and the slider 5 is moved by the spring coil 10.
Return to the position of FIG. At that time, the gas in the storage section 1 is exhausted to the outside from the exhaust port 15 through the peripheral edge of the slider 5 through the opening 6. The position of the slider 5 has returned to the initial state in FIG.

The fact that the lid 11 and the shaft 14 are made of a magnetic material is also a good conductor of heat.
In combination with the provision of 15, the heat radiation effect is good even if the coil 7 generates heat.

[0025]

As described above, the air valve of the present invention is provided with the above-mentioned shaft body, and the connection area between the cylindrical portion and the yoke is enlarged, so that the magnetic resistance to the magnetic flux path is greatly reduced. This is effective in reducing power consumption and reducing the size of the housing. Further, since the heat radiation effect is good, stable performance can be ensured even in long-term operation.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of an embodiment of the present invention;

FIG. 2 is a longitudinal sectional view showing a configuration of a conventional air valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage part 2 Housing 3 Yoke 4 Cylindrical part 5 Slider 6 Opening 7 Coil 8 Packing 9 Coil bobbin 10 Spring coil 11 Yoke lid 12, 13 Gap 14 Shaft 15 Exhaust port 16 Flange 17 Projection

Continued on the front page (72) Inventor Yoshihiko Sano 801 Fudo-cho, Shimoji-dori Horikawa Higashi-iri, Shimogyo-ku, Kyoto-shi, Kyoto F-term in Omron Life Science Research Institute, Inc. 3H055 AA03 AA13 BA02 BA13 BB02 BB13 BC09 CC06 CC23 GG22 HH01 3H106 DA07 DA12 DA23 DB02 DB12 DB23 DB32 DB38 DC02 DD02 EE34

Claims (2)

[Claims] 1. A slider, comprising: a hollow cylindrical portion connected to a gas storage portion and made of a magnetic material having an opening at the other end; and a substantially cylindrical slider facing the opening. The cylindrical portion is magnetized by a coil, is movable until the slider comes into close contact with the opening of the cylindrical portion, and has a sealing portion facing the opening, and is formed of the magnetic material. Forms a casing made of a magnetic material via a coil bobbin and a coil, and a gap provided between the casing and the peripheral edge of the slider and the casing is a gas flowing out of the opening of the tubular section. An air valve serving as an exhaust portion for exhausting air, wherein an exhaust port provided at a rear end of a slider is formed at a bottom of the housing, and a magnetic field is closed between the housing and the slider via the bottom. And a cylindrical member for storing gas. An air valve, wherein a tip connected to the storage unit is provided with a flange protruding in the outer peripheral direction of the housing so as to be in close contact with the yoke, and the slider is provided on the housing with a projection in the operation direction. . 2. The slider according to claim 1, wherein the protrusion has a shape of a shaft inserted into the cylindrical slider, and a length of the shaft is set shorter than a shaft length of the slider. 1. The air valve according to 1.