JP3824213B2 - Sphygmomanometer exhaust valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blood pressure monitor exhaust valve connected to a cuff of a blood pressure monitor.
[0002]
[Prior art]
Conventionally, as a sphygmomanometer exhaust valve (hereinafter simply referred to as an exhaust valve), a rubber valve having a simple structure with a slit is used. This rubber valve type exhaust valve has few parts and is inexpensive, but the exhaust depends on the elastic characteristics of the rubber and the size of the slit, so if the cuff pressure deviates from the initial setting range, it can be exhausted at a constant speed. In addition, there is a problem that rapid exhaust is not easy.
[0003]
Currently, as an exhaust valve for solving this problem, for example, an exhaust valve disclosed in Japanese Patent Laid-Open No. 2000-346230 is used. A cross-sectional view of this exhaust valve is shown in FIG. In this exhaust valve, a through hole 1B provided in the front surface of the case 1 is connected to a cuff (not shown) by a tube. A packing 5 on a plate made of an elastic material is press-fitted into the case 1 so as to face the through hole 1B, and in the center of the packing 5 is slidable in the center hole of the coil bobbin 2 around which the coil 3 is wound. A supported permanent magnet slider 4 is provided.
[0004]
The coil 3 and the slider 4 constitute electromagnetic driving means for moving the slider 4. When the coil 3 is not energized, the slider 4 is pressed by the packing 5 so that the through hole 1B and the packing 5 are farthest apart, and the exhaust valve is fully opened. When the coil 3 is energized, the electromagnetic force acting on the slider 4 causes the slider 4 to move toward the through hole 1B against the spring force of the packing 5, and the distance between the central portion of the packing 5 and the through hole 1B is controlled. The Therefore, by controlling the current sent to the coil 3, the exhaust speed can be appropriately controlled by this exhaust valve, and rapid exhaust can be facilitated by fully opening the exhaust valve.
[0005]
Further, as this type of sphygmomanometer exhaust valve, one disclosed in Japanese Patent Laid-Open No. 6-47008 is also used. A cross-sectional view of this exhaust valve is shown in FIG. The exhaust valve includes a cylindrical frame 110 and a front case 102 as a lid, and an outlet 1-1 provided in the front case 102 is connected to a cuff (not shown) by a tube. In order to move a drive shaft (moving body) 104 provided with an orifice packing (valve) 103 facing the outflow port 1-1 inside the frame, a concentric yoke 106, magnet 108, plate 107, drive shaft An electromagnetic driving means comprising a coil 105 fixed to 104 is disposed.
[0006]
The drive shaft 104 is fixed at both ends in a state where the drive shaft 104 is inserted into a through hole provided in the yoke 106 and the coil 105 is inserted into a gap between the yoke 106 and the plate 107. Further, the damper 110 is supported by the frame 110 while being urged away from the outlet 1-1 by dampers (springs) 9-1 and 9-2. This exhaust valve can also control the exhaust speed in the same manner as the exhaust valve shown in FIG. 3 by controlling the current flowing through the coil 105.
[0007]
[Problems to be solved by the invention]
Incidentally, the exhaust valve shown in FIG. 3 has the following problems.
(1) Since the slider 4 is slidably supported in the center hole of the coil bobbin 2, the center hole of the slider 4 and the coil bobbin 2 must be processed with high accuracy, and the exhaust valve cannot be easily manufactured.
(2) Since the slider 4 for holding the permanent magnet is heavy and the coil bobbin 2 supports the slider 4 in a slidable manner, both of them require a certain length. Therefore, this exhaust valve is limited in size and weight. That there is.
(3) When assembling the exhaust valve, the packing 5 must be pressed into the case 1 with a strong force. At this time, the packing 5 is distorted unevenly, and an assembly error is likely to occur. If the packing 5 is inclined with respect to the through-hole 1B, this exhaust valve may cause exhaust control failure.
(4) When the exhaust valve is assembled, the packing 5 is first press-fitted into the small case 1, and then the coil bobbin 2 with the slider 4 inserted into the center hole is press-fitted into the case 1. The exhaust valve is not easy to manufacture.
[0008]
Also, the exhaust valve shown in FIG. 4 has the following problems.
(1) When the exhaust valve is assembled, the two dampers 9-1 and 9-2 are deformed so as to generate a spring force with respect to the drive shaft 104, and the drive shaft 104 and the frame 110 are At this time, the two dampers are distorted unevenly, and an assembly error is likely to occur. If the drive shaft 104 is tilted due to this error, the exhaust valve is considered to have poor exhaust control. There is a risk of becoming.
(2) When assembling the exhaust valve, it is necessary to provide through holes in the small yoke 106, plate 107, and magnet 108, and it is not easy for workers to assemble these parts in a small frame. The exhaust valve is not easy to manufacture.
[0009]
Therefore, in view of the above problems, the present invention is easier to manufacture than a conventional sphygmomanometer exhaust valve capable of controlling the evacuation speed, and is less likely to cause exhaust control failure due to an assembly error, and is a smaller and lighter sphygmomanometer. An object is to provide an exhaust valve.
[0014]
[Means for Solving the Problems]
In order to solve the above-described problem, in the exhaust valve for a blood pressure monitor according to the first aspect of the present invention, a case consisting of an upper case and a lower case, an exhaust port provided in the upper case, and an exhaust port provided in the case A movable body provided with a valve facing the exhaust port, an electromagnetic drive means disposed in the case and controlling ventilation of the exhaust port by moving the movable body, and supporting the movable body, in the sphygmomanometer exhaust valve having an inhibiting spring movement thereof, said spring is a single disk-shaped spring, whose periphery is sandwiched between the upper surface of the lower case and the lower surface of the upper case , the moving body is a flat shape, together with the valve center of the upper surface is joined, the spring is joined to the top rim, said electromagnetic driving means is accommodated by fitting inside the lower case consisting of a bottom and a peripheral wall with A circular container-like yoke (62) in a U-shaped section, a disc-shaped magnet that is bonded on the bottom surface of the yoke (64), a disk-shaped pole pieces joined on the magnet (66), said yoke characterized in that it is constituted from a peripheral wall (63) and the coil fixed to the movable body while being arranged in the gap between the pole piece (80).
[0015]
In this way, to assemble the exhaust valve, the yoke, magnet, pole piece, movable body with a pre-fixed coil, spring, valve, and upper case are joined together in order from the bottom in the lower case. This exhaust valve can be assembled with just a few steps. In particular, in order to assemble the movable body in the case, when joining the upper case and the lower case, the peripheral edge of one spring supporting the movable body is placed between the upper surface of the lower case and the lower surface of the upper case. At this time, since a strong force or high heat is not applied to the spring unlike press-fitting or welding, the spring is not distorted unevenly. Moreover, since the moving body is flat, the space of the moving body is reduced.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. A longitudinal sectional view of the exhaust valve 50 of this embodiment is shown in FIG. 1, and a plan view of a leaf spring 72 used in the exhaust valve 50 is shown in FIG.
The exhaust valve 50 is formed by forming a case 56 from a shallow circular container-like lower case 52 having a U-shaped vertical cross section and an upper case 54 as a lid, and a base 60 having an exhaust port 58 penetrated through the upper case 54 is provided. The exhaust port 58 is connected to a cuff (not shown) and a tube.
[0018]
In the lower case 52, a circular container-shaped yoke 62 having a U-shaped longitudinal cross section of a ferromagnetic material is fitted and accommodated, and a disk-shaped magnet 64 is joined to the yoke 62 by an adhesive. A ferromagnetic disk-shaped pole piece 66 is bonded to the top with an adhesive. The yoke 62 may be simply accommodated in the lower case 52 and may be changed so as to be joined to the bottom surface or the bottom surface of the lower case 52 and the peripheral wall 53 with an adhesive. A magnetic circuit including the yoke 62, the magnet 64, the pole piece 66, and the circumferential wall 63 of the yoke 62 and the gap 68 between the pole pieces 66 is formed. The gap 68 is directed from the pole piece 66 to the circumferential wall 63 of the yoke 62. A radial magnetic field is generated. To assemble this magnetic circuit, the yoke 62 is fitted and accommodated in the lower case 52, and then the magnet 64 and the pole piece 66 are stacked on the yoke 62 in order from the bottom and joined together with an adhesive or the like. This assembly is easy.
[0019]
Inside the case 56, between the pole piece 66 and the upper case 54, a flat moving body 70 having a valve 78 facing the exhaust port 58 is disposed, and this moving body 70 is a disk. A plate spring 72 supports the case 56. Since the moving body 70 is flat and the number of leaf springs 72 is one, space is saved, and the exhaust valve can be made smaller and lighter.
[0020]
The leaf spring 72 is made of phosphor bronze having a thickness of about 0.3 mm and is provided with several slits 76 for adjusting elasticity in a concentric manner as shown by hatching in FIG. A central hole 72a for positioning the moving body 70 is provided at the center, and a positioning protrusion 72b and a front / back determining protrusion 72c for fixing to the case 56 are provided at the peripheral edge 72e.
[0021]
Here, by providing the slit 76 in the leaf spring 72, the connecting portion 72d that connects the peripheral edge 72e and the edge of the center hole 72a on the radius passing through each protrusion 72b extends in the circumferential direction and is adjacent to the protrusion 72b. Since it is folded back in the vicinity and becomes a beam longer than the radius of the leaf spring 72, the leaf spring 72 can realize a large flexibility (a small spring constant). When the flexibility increases, the diameter of the leaf spring 72 can be reduced, so that the exhaust valve 50 can be reduced in size and weight. In order to adjust the spring force of the leaf spring 72, the thickness of the leaf spring 72 may be changed instead of providing the leaf spring 72 with the slit 76 as shown in FIG. A through hole as in the conventional example shown in FIG. 3 may be provided.
[0022]
A coil 80 to be inserted into the gap 68 between the yoke 62 and the pole piece 66 is fixed to the lower portion of the moving body 70. The coil 80 is connected to a lead wire 81 and is supplied with an output current from an exhaust valve control circuit (not shown). Here, the coil 80, the yoke 62, the magnet 64, and the pole piece 66 constitute electromagnetic driving means for moving the moving body 70.
[0023]
A through hole 70a is provided in the center of the moving body 70, and a valve 78 is joined to the through hole 70a with an adhesive or the like. The valve 78 is made of an elastic body such as rubber and has a hat shape. Even when the valve 78 comes into contact with the exhaust port 58 projecting into the case 56 at a slight inclination, the valve 78 is easily deformed to ensure the exhaust port. 58 can be closed. Further, a stepped portion 70b is provided on the upper surface of the moving body 70 so as to be located outside the valve 78, and the center hole 72a of the leaf spring 72 is engaged with the stepped portion 70b, so that the stepped portion 70b The upper surface and the edge of the center hole 72a of the leaf spring 72 are joined by an adhesive or the like.
[0024]
The peripheral wall 53 of the lower case 52 is provided with a stepped portion 53a that joins the peripheral edge 72e of the plate spring 72, and the positioning protrusion 72b of the plate spring 72 and the front and back determining protrusion 72c are respectively engaged at predetermined positions of the stepped portion 53a. As the engaging portion 53b to be joined, a step portion 53a is extended outward (see the left step portion 53a in FIG. 1). On the other hand, a rib 77 is provided in the vicinity of the peripheral edge 55 of the upper case 54 so as to come into contact with the inner peripheral surface of the peripheral wall 53 of the lower case 52 when the upper case 54 and the lower case 52 are coupled. The peripheral edge 72e of the leaf spring 72 is between the lower surface of the rib 77 and the upper surface of the stepped portion 53a provided in the lower case 52 when the upper case 54 and the lower case 52 are joined by a small screw (not shown). By being pinched, it is fixed to the case 56.
[0025]
Thus, when the upper case 54 and the lower case 52 are joined, the peripheral edge 72e of one leaf spring 72 that supports the moving body 70 is provided on the upper surface of the stepped portion 53a of the peripheral wall 53 and the lower surface of the upper case 54. The movable body 70 can be easily assembled in the case 56 because it may be sandwiched between the ribs 77. At this time, since strong force or high heat is not applied to the leaf spring 72 unlike press-fitting or welding, the leaf spring 72 is not distorted unevenly, and the valve 78 provided on the moving body 70 is connected to the exhaust port 58. In contrast, the exhaust control is not poor due to the tilt. Further, the stepped portion 70b of the moving body 70 and the center hole 72a of the leaf spring 72 are engaged, and the engaging portion 53b provided on the peripheral wall 53 of the lower case 52, the positioning projection 72b of the leaf spring 72, and the front and back determining projection pieces. By engaging 72c, the movable body 70, the leaf spring 72, and the case 56 can be joined to each other with high accuracy and without making a mistake in the front and back sides.
[0026]
It should be noted that the positioning protrusion 72b and the front / back determining protrusion 72c are not provided on the peripheral edge 72e of the leaf spring 72, the stepped portion 53a and the engaging portion 53b are not provided on the peripheral wall 53 of the lower case 52, and the lower surface of the upper case 54 is provided. The peripheral edge 72e of the leaf spring 72 may be directly sandwiched between the upper surface of the peripheral wall 53 of the lower case 52 and the lower surface of the peripheral edge 55 of the upper case 54 without providing the rib 77.
[0027]
In order to assemble the exhaust valve 50, first, insert molding is performed in which the yoke 62 is fitted and accommodated in the lower case 52. Next, the magnet 64 and the pole piece 66 are stacked on the yoke 62 in order from the bottom. Join them together. Next, the coil 80 is fixed to the lower surface of the moving body 70 in advance, the coil 80 is inserted into the gap 68 between the yoke 62 and the pole piece 66, and the moving body 70 is placed on the pole piece 66. Next, the valve 78 is joined to the center of the upper surface of the moving body 70.
[0028]
Then, the positioning protrusion 72 b and the front / back determination protrusion 72 c of the leaf spring 72 are engaged with the engagement portion 53 b provided on the peripheral wall 53 of the lower case 52, and the upper surface of the stepped portion 70 b of the moving body 70 and the leaf spring 72. The edge of the central hole 72a is joined with an adhesive or the like. At this time, the peripheral edge 72e of the leaf spring 72 is somewhat separated from the upper surface of the stepped portion 53a provided on the peripheral wall 53. If the adhesive is applied in advance to the lower surface of the peripheral edge 72e of the leaf spring 72 or the upper surface of the stepped portion 53a, and the upper case 54 is joined to the lower case 52 with a small screw (not shown) or the like, the upper case 54 is provided. The peripheral edge 72e of the leaf spring 72 is sandwiched between the lower surface of the rib 77 and the upper surface of the stepped portion 53a provided in the lower case 52, and the exhaust valve 50 is completed.
[0029]
In this way, when assembling the exhaust valve 50, the exhaust valve 50 can be assembled by simply joining the necessary parts while stacking the components in order from the bottom, and the conventional example shown in FIG. Thus, since it is not necessary to make a through-hole in the yoke 62, the magnet 64, and the pole piece 66, the assembly of the exhaust valve 50 is easy.
The operation of this embodiment will be described. When the coil 80 is not energized, the moving body 70 is in contact with the pole piece 66 by the spring force of the leaf spring 72, the exhaust port 58 and the valve 78 are farthest apart, and the exhaust valve 50 is fully opened. When a current is passed through the coil 80 in a predetermined direction, the moving body 70 moves in the direction of the upper case 54 against the spring force of the leaf spring 72 by the electromagnetic force exerted on the coil 80 by the magnetic field in the gap 68. Therefore, if the current flowing through the coil 80 is appropriately controlled, the exhaust port 58 and the valve 78 can be controlled at an appropriate interval so that the exhaust valve 50 can be controlled to an appropriate opening degree. The exhaust valve 50 can be completely closed by closing.
[0030]
By the way, the present invention is not limited to the above embodiment, and various modifications are possible. For example, when the moving body 70 is assembled in the case 56, a gap exists between the lower end surface of the moving body 70 and the pole piece 66 without bringing the lower end surface of the moving body 70 into contact with the pole piece 66. May be. If a gap is provided between the two, during rapid exhaust, the moving body 70 can be separated from the exhaust port 58 by the amount of the clearance, so that further rapid exhaust is possible.
[0034]
【The invention's effect】
According to the present invention, the exhaust valve is simply joined to the lower case, the yoke, the magnet, the pole piece, the movable body, the spring, the valve, and the upper case in which the coil is fixed in advance, while overlapping the necessary portions in order from the bottom. As a result, the exhaust valve can be easily manufactured. In particular, in order to assemble the movable body in the case, when joining the upper case and the lower case, the peripheral edge of the spring joined to the movable body may be sandwiched between the upper surface of the lower case and the lower surface of the upper case. Therefore, the manufacture of the exhaust valve becomes easier. Moreover, by sandwiching the peripheral edge of the spring between the upper surface and the upper case lower surface of the lower case, so assembly errors by distorting the spring uneven does not occur, a valve provided on the moving body exhaust port to Therefore, the exhaust control does not become poor. Furthermore, since the flat movable body is supported by a single spring, the space between the movable body and the spring is saved, so that the exhaust valve can be made smaller and lighter.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an exhaust valve according to an embodiment of the present invention.
FIG. 2 is a plan view of a leaf spring used in the exhaust valve.
FIG. 3 is a cross-sectional view of an exhaust valve used in a conventional blood pressure monitor.
FIG. 4 is a cross-sectional view of another exhaust valve used in a conventional blood pressure monitor.
[Explanation of symbols]
50 Sphygmomanometer exhaust valve 52 Upper case 54 Lower case 56 Case 58 Exhaust port 62 Yoke (electromagnetic drive means)
64 Magnet (Electromagnetic drive means)
66 Pole piece (Electromagnetic drive means)
68 Clearance 70 Moving object 72 Leaf spring (spring)
76 Slit 78 Valve 80 Coil (Electromagnetic drive means)

Claims (1)

A case composed of an upper case and a lower case, an exhaust port provided in the upper case, a movable body disposed in the case and provided with a valve facing the exhaust port, and disposed in the case, In an exhaust valve for a sphygmomanometer having electromagnetic driving means that controls ventilation of the exhaust port by moving a moving body, and a spring that supports the moving body and suppresses the movement thereof,
The spring is a single disk-shaped spring, whose periphery is sandwiched between the upper surface of the lower case and the lower surface of the upper case,
The moving body has a flat shape, the valve is joined to the center of the upper surface, and the spring is joined to the periphery of the upper surface,
The electromagnetic drive means is fitted into the lower case and accommodated, and has a circular container-shaped yoke (62) having a U-shaped longitudinal section composed of a bottom surface and a peripheral wall, and a disk-shaped joint joined on the bottom surface of the yoke. A magnet (64), a disc-shaped pole piece (66) joined on the magnet, and a coil disposed in a gap between the peripheral wall (63) of the yoke and the pole piece and fixed to the moving body (80) The sphygmomanometer exhaust valve characterized by comprising the following.

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