JP2000320705A - Gas adjustment valve unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a gas adjustment valve unit by effectively using gas pressurized by a pump for closing an opening part. SOLUTION: This unit consists of a case 1 provided with a connection part 1b connected to a pressurized gas supply passage and an opening part 1c, a packing 2, a coil bobbin 3, a first slider 5 driven by a coil 4, a second slider 7 moved by pressure of pressurize gas and a compressed coil spring 8. The second slider 7 is isolated from the packing 2 and an opening part 2a of the packing 2 is opened when no voltage is applied on to the coil 4. The first slider 5 presses and deforms the packing 2, and the packing 2 is pressed onto the second slider 7 to close the opening part 2a when a voltage is applied on to the coil 4. If the gas is gradually pressurized under this condition, the second slider 7 is moved to the packing 2 side and is press-contacted onto the opening part 2a of the packing 2. Thereby, a leak to the atmosphere is completely shut off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas control valve unit connected to a gas supply path pressurized by a pump, and more particularly to a valve unit suitable for air control of a blood pressure monitor.

[0002]

2. Description of the Related Art In an automatic sphygmomanometer, a gas adjusting valve unit for adjusting the pressure of air supplied to an arm band by pressurizing a pump is provided with an opening such as a packing at an opening for leaking pressurized air to the atmosphere. A valve member made of a flexible material is arranged, and a pressing force (valve load) is applied to the valve member in a valve closing direction by a slider driven by a DC solenoid to adjust a leak amount to adjust air pressure. The following is used conventionally.

[0003]

However, in the above-mentioned conventional gas regulating valve unit used for a blood pressure monitor or the like, when the air leak is completely shut off by completely shutting off the opening of the atmospheric leak, the air leak is prevented. The opening is shut off exclusively by the driving force (magnetic force) of the DC solenoid. Therefore, the DC solenoid needs to be a large one having a large magnetic force, which is a factor that hinders the miniaturization of the valve unit. I was

[0004] Therefore, it is an object to reduce the size of the solenoid of the gas control valve unit.

[0005]

The present invention has solved the above-mentioned problem by effectively utilizing the pressure of gas pressurized by a pump for closing an opening.

That is, a gas control valve unit according to the present invention is a gas control valve unit connected to a supply path of gas pressurized by a pump, wherein a connection part connected to the supply path and an atmosphere side are provided. A case having an opening that opens into the case, and an opening that is disposed at a position facing the opening of the case and has a peripheral portion that is tightly fixed to the case, and that communicates with the opening of the case at a central portion. And a flexible member having a position opposite to the opening of the case and disposed at a position opposite to the opening of the flexible member, and driven by a solenoid to move the flexible member to the opening of the case. A first movable pressing member that presses toward the opening, and is disposed at a position facing the opening of the flexible member on the opening side of the case, and the opening of the flexible member can be closed; Close opening In this state, the flexible member is moved in the direction of pressing the flexible member from the side opposite to the first movable pressing member by the pressure of the gas pressurized by the pump, and is pressed against the opening of the flexible member. A second movable pressing member configured and disposed between the flexible member and the second movable pressing member, for urging the second movable pressing member in a direction away from the flexible member. And a biasing member.

The second movable pressing member closes the opening of the flexible member when the flexible member is pressed and deformed by the first movable pressing member, and closes the opening. In, by making a difference in the area receiving the pressure of the gas pressurized by the pump on both sides of the moving direction, the flexible member is moved in the direction of pressing from the side opposite to the first movable pressing member, The flexible member may be pressed against the opening.

[0008] The gas regulating valve unit according to the present invention is connected to a tube or the like that supplies gas pressurized by a pump to an arm band or the like in, for example, an automatic sphygmomanometer. Then, when a voltage is applied to the solenoid, a magnetic force is generated, and the first movable pressing member is driven in a direction of pressing the flexible member toward the opening, and the flexible member is pressed and deformed to deform the second movable member. The opening of the flexible member is pressed against the pressing member so that the second
Is closed by the movable pressing member.

When the second movable pressing member closes the opening of the flexible member as described above, the side that comes into contact with the flexible member has an opposite area that receives the pressure of the gas pressurized by the pump. Smaller than.

Then, when the gas pressure is increased by the pump and the gas pressure rises and exceeds a predetermined level, and the force imbalance due to the difference in the pressure receiving area becomes large, the second movable member is actuated by the urging force of the urging member. 1 against the pressing force of the movable pressing member,
The flexible member is moved in the direction of pressing from the side opposite to the first movable pressing member, is pressed against the opening of the flexible member, and the pressing force completely closes the opening of the flexible member. Completely shut off the opening from the atmosphere side.

In this case, the solenoid for driving the first movable pressing member is provided when the gas pressure is below a predetermined level and the second movable pressing member is urged by the urging means to be at a fixed position on the case side. It is sufficient if the magnetic member generates a magnetic force enough to press the flexible member against the second movable pressing member, and the size can be reduced. In addition, the second movable member can be arranged without taking a space on the case opening side. Therefore, the size of the gas control valve unit can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a state in which no voltage is applied to the coil of the gas control valve unit, and FIG. 2 shows a state in which a voltage is applied to the coil of the gas control valve unit until the gas pressure rises. FIG. 3 shows a state in which the gas pressure exceeds a predetermined level.

The gas regulating valve unit according to this embodiment is used, for example, in an automatic sphygmomanometer, and a case 1 constituting a unit main body has a cylindrical shape and a cylindrical space 1a therein. At one end, there is provided a connecting portion 1b connected to a supply path (for example, a tube connected to an arm band) of a gas (for example, air) pressurized by a pump, and at the other end, an opening 1c which opens to the atmosphere side. It has.

At a position facing the opening 1c of the case 1, a packing 2 (flexible member) having a flanged hat shape made of a flexible material and having an opening 2a at a center position is provided.
The coil bobbin 3 is arranged so as to be in close contact with the case 1 at the peripheral portion, and the packing 2 is interposed therebetween. The packing 2 and the coil bobbin 3 are fixed to the case 1 by tightening together.

A coil 4 constituting a solenoid is wound around the outer periphery of the coil bobbin 3, and a first slider 5 (first movable pressing member) is slidably mounted in the center space in the axial direction. Have been.

The first slider 5 has a circular cross-section in which a part of a circle is cut out, and the cut-out part forms a passage 6 between the first slider 5 and a sliding surface on the inner periphery of the coil bobbin 3. It is composed.

The opening 1c of the case 1 has a second slider 7 at a position facing the opening 2a of the packing 2.
(A second movable pressing member) is disposed. Like the first slider 5, the second slider 7 has a sliding portion having a circular cross-section with a partially cut circular shape, and a pressing portion having a larger diameter at its rear end (right end in the figure). The sliding portion is inserted into the cylindrical space 1a inside the case 1 in a sliding contact state, and the front surface (the left surface in the figure) of the pressing portion faces around the opening 1c on the end surface of the case 1, The rear surface (the right surface in the figure) is configured to face the opening 2 a of the packing 2. Also, the second slider 7
A projection (not shown) is formed on the rear surface of the pressing portion, thereby securing a passage between the rear surface of the pressing portion and the end surface of the case 1. Then, a stepped portion on the peripheral edge of the pressing portion of the second slider 7 serves as a spring receiver, and a compression coil spring 8 is mounted between the second slider 7 and the packing 2. Biased away from

As described above, the sliding portion of the second slider 7 has a circular cross section in which a part of a circular shape is cut out, and the cut portion forms a cylindrical space 1a of the case 1. A passage 9 is formed between the inner peripheral surface and the sliding surface.

A ring-shaped valve seat portion 2b is formed on the periphery of the opening 2a of the packing 2 on the side facing the second slider 7, so that the second slider 7 is seated in close contact. .

The packing 2 includes a first slider 5.
Around the opening 2a on the side opposite to, a protrusion 2c having four stripes in the radial direction is formed. This projection 2c
The groove of the first slider 5 and the opening 2 of the packing 2
A passage is ensured at the contact portion with a.

From the rear end of the coil bobbin 3, a pair of lead wires 10 is led out. By applying a voltage to the lead wire 10, a current flows through the coil 4.

When no voltage is applied to the coil 4, the second slider 7 is separated from the packing 2 by the repulsive force of the compression coil spring 8, as shown in FIG. The second opening 2a is open. Then, from the front (the side indicated by A in FIG. 1) of the gas adjusting valve unit, the gas adjusting valve unit passes through the cylindrical space 1a of the case 1,
It passes through the passage 9 between the second slider 7 and the sliding surface of the inner periphery of the cylindrical space 1a of the case 1, passes through the opening 1c of the case 1, passes through the case 1 end face around the opening 1c and the second end. The opening 2 of the packing 2 passes between the front surface of the pressing portion of the slider 7 and
a, through the passage formed by the groove of the projection 2c, through the passage 6 between the first slider 5 and the sliding surface of the inner periphery of the coil bobbin 3, and backward (the side indicated by B in FIG. 1). ) Is formed. For this reason, this gas regulating valve unit is used, for example, in an automatic sphygmomanometer, and a tube (not shown) for supplying air pressurized by a pump to an arm band or the like.
With the connection 1b of the case 1 connected, the pressurized air in the tube flows from A to B in FIG. 1 and leaks to the atmosphere.

When a voltage is applied to the coil 4 from the state shown in FIG. 1, a magnetic force corresponding to the voltage is generated,
Is driven, and presses the packing 2 with a pressing force corresponding to the strength of the magnetic force. As a result, as shown in FIG.
The packing 2 is deformed and pressed against the second slider 7, and the end face of the second slider 7 comes into close contact with the valve seat 2 b of the packing 2 to close the opening 2 a.

When air is pressurized by the pump in this state, the rear side (the right side in the figure) of the second slider 7
Since the end face is in close contact with the valve seat portion 2b of the packing 2 and the central portion is blocked from the pressurized air, the area receiving the pressure of the air pressurized by the pump is smaller than the front side (the left side in the figure). The imbalance of the forces acting back and forth occurs, causing the second slider 7 to move rearward (rightward in the figure).
A moving force is generated. Then, when the pressure of the air is gradually increased by the pump and the pressure of the air is increased and the moving force is increased, as shown in FIG.
Moves while pressing the packing 2 from the side opposite to the first slider 5 against the biasing force (repulsive force) of the first slider 5 and the valve seat around the opening 2a of the packing 2. The opening 2a of the packing 2 is completely closed and the opening 1c of the case 1 is completely shut off from the atmosphere due to the pressing force.

In this embodiment, the case where the present invention is used for a blood pressure monitor has been described as an example.
The present invention can be applied to gas control valve units for various uses.

[0027]

As is apparent from the above description, according to the present invention, the second movable pressing member is placed at the opening of the gas regulating valve unit by effectively utilizing the pressure of the gas pressurized by the pump. Since the pressure contact is made to completely shut off the leak, the solenoid for driving the first movable pressing member may be small, and the size of the gas adjusting valve unit can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which no voltage is applied to a coil of a gas control valve unit according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a state in which a voltage is applied to a coil of the gas control valve unit according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state in which the gas pressure of the gas regulating valve unit according to the embodiment of the present invention has increased and the opening has been completely shut off.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 1a Cylindrical space 1b Connecting part 1c Opening 2 Packing (flexible member) 2a Opening 2b Valve seat part 3 Coil bobbin 4 Coil 5 1st slider (1st movable pressing member) 7 2nd slider (2nd slider) 2 movable pressing member) 8 Compression coil spring (biasing member)

Claims (2)

[Claims] 1. A gas control valve unit connected to a supply path of a gas pressurized by a pump, comprising: a connection part connected to the supply path; and an opening part opened to the atmosphere side. A flexible member disposed at a position facing the opening of the case, a peripheral portion of which is tightly fixed to the case, and a flexible member having an opening communicating with the opening of the case at a central portion; A first movable pressing member which is arranged at a position opposite to the opening on the opposite side to the opening of the flexible member and is driven by a solenoid to press the flexible member toward the opening of the case; And disposed at a position facing the opening of the flexible member on the opening side of the case, the opening of the flexible member can be closed, and the pump is closed by the pump in a state where the opening is closed. Pressurized gas A second movable pressing member configured to move in a direction of pressing the flexible member from a side opposite to the first movable pressing member by a force and to be pressed against the opening of the flexible member; A biasing member disposed between the flexible member and the second movable pressing member for biasing the second movable pressing member in a direction away from the flexible member; Valve unit. 2. The second movable pressing member closes the opening of the flexible member by the flexible member being pressed and deformed by the first movable pressing member, and closing the opening. In this state, there is a difference between the areas receiving the pressure of the gas pressurized by the pump on both sides of the moving direction, so that the flexible member is moved in the direction of pressing the flexible member from the side opposite to the first movable pressing member. The valve unit for gas adjustment according to claim 1, wherein the valve unit is pressed against the opening of the flexible member.