JP2005155898A - Valve element, and flow rate adjusting device and blood-pressure meter comprising valve element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve element capable of performing the fine adjustment of a flow rate of fluid with high accuracy. <P>SOLUTION: In this valve element 27 of which a surface 37 is closely kept into contact with or separated from a projecting end 29 of a circulation port 28 from which the fluid flows out, for opening and closing the circulation port, a plurality of projecting parts 50 of the uniform shape are formed on at least a part kept into contact with the projecting end 29 of the circulation port. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a valve body and a flow control device including the valve body, and in particular, a flow control device suitable for being applied to an exhaust device for a sphygmomanometer, a valve body provided in the flow control device, and this The present invention relates to a sphygmomanometer using a flow control device.

  Various types of sphygmomanometers have been proposed. After increasing the pressure in the cuff zone to a predetermined value, the pressure is gradually reduced, and the blood pressure value of each person is measured during this pressure reduction process. There is. In such a sphygmomanometer, a sphygmomanometer exhaust device is used to gradually reduce the pressure in the cuff belt.

  As described in Patent Document 1, this sphygmomanometer exhaust device presses or separates a housing connected to a cuff belt or a pump through a flow port and the surface of a valve body (orifice packing) to a flow port protrusion end of the flow port. A driving shaft that closes or opens the flow port by the valve body, a driving device that includes a driving coil that drives the driving shaft based on electromagnetic force, and a driving shaft in a direction opposite to the direction of electromagnetic force. And an urging member for urging.

  When blood pressure is measured using the sphygmomanometer exhaust device, first, an electromagnetic force is generated by a drive coil to drive the drive shaft, and the valve body at the tip of the drive shaft is pressed against the tip of the flow port and the flow port Is closed. In this state, air is supplied into the cuff band by a pressure pump to pressurize the cuff band.

Next, the process proceeds to the cuff zone decompression process. At this time, the electromagnetic force generated by the drive coil is weakened by gradually decreasing the current supplied to the drive coil. Then, the drive shaft is moved by the urging force of the urging member, the valve body is moved away from the tip of the flow port, the valve body is gradually opened, and the air in the cuff belt passes through the flow port and moves from the inside of the housing to the atmosphere. A small amount is exhausted. Each person's blood pressure is measured in the decompression process in the cuff belt by this minute exhaust.
Japanese Patent No. 3029073

  However, in the sphygmomanometer exhaust device, since the valve body and the flow port tip are both formed on a flat surface, the valve body is pressed against or separated from the flow port tip by electromagnetic force or biasing force via the drive shaft. Sometimes, the flow rate change of the air flowing through the gap between the tip of the circulation port and the valve body becomes abrupt. For this reason, when air is discharged from the inside of the housing to the atmosphere through the circulation port, it may be difficult to finely adjust the flow rate.

  An object of the present invention has been made in consideration of the above-described circumstances, and a valve body capable of performing a fine flow rate adjustment of a fluid with high accuracy, a flow rate adjustment device including the valve body, and the flow rate adjustment device. It is to provide a blood pressure monitor used.

  According to the first aspect of the present invention, there is provided a valve body in which a surface is pressed against or separated from a tip of a flow port from which a fluid flows out from the flow port, and the flow port is closed or opened. A plurality of convex portions having the same shape are formed at locations that contact the protruding end.

  According to a second aspect of the present invention, there is provided a valve body in which a surface is pressed against or separated from a tip of a flow port from which a fluid flows out from the flow port, and the flow port is closed or opened. A plurality of convex portions are formed at locations that contact the protruding ends, and the convex portions are regularly arranged on the surface at least at locations that contact the protruding ends of the flow port.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the convex portion is formed in a state of being in contact with two or more on one side in a vertical cross section passing through the axis of the flow port protruding end. It is a feature.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the convex portion is formed as a projection of a cone, a hemisphere, a column, or the like independent in the vertical and horizontal directions, or in one direction. Are formed as ridges continuous in the same cross section.

According to the fifth aspect of the present invention, there is provided a housing in which a flow port through which a fluid flows is formed and a flow port protruding end from which the fluid flows out from the flow port, and a surface disposed in the housing. A valve body that closes or opens the flow port by press-contacting or separating from the protruding end to adjust the flow rate of the fluid flowing through the flow port, and the valve body that is disposed in the housing, the valve body being an axis thereof A plurality of convex portions having the same shape are formed on the surface of the valve body at least at locations that contact the protruding end of the flow port. It is characterized by that.

The invention described in claim 6 is characterized in that, in the invention described in claim 5, the convex part of the valve body is regularly arranged on the surface at least at a position where it contacts the end of the flow port. .

  The invention according to claim 7 is the invention according to claim 5 or 6, wherein the convex part of the valve body is formed in a state where two or more are in contact with one side in a longitudinal section passing through the axis of the flow port protruding end. It is characterized by that.

  The invention according to claim 8 is the invention according to any one of claims 5 to 7, wherein the convex portion of the valve body is a protrusion such as a cone, a hemisphere, or a column that is independent in the vertical and horizontal directions, or It is characterized by being formed as ridges that are continuous in the same cross section in one direction.

  The invention according to claim 9 is the sphygmomanometer exhaust device for discharging air supplied in a cuff belt wound around a part such as an arm or wrist of a human body in the invention according to any one of claims 5 to 8 It is characterized by being used as.

  A tenth aspect of the present invention is a sphygmomanometer characterized by using the flow control device according to any one of the fifth to sixth aspects.

According to the valve body according to the present invention or the flow control device provided with the valve body, since the plurality of convex portions formed on the surface of the valve body have the same shape, the valve body moves in the axial direction, When these convex portions are deformed by being pressed against or separated from the tip of the circulation port, the deformation amounts of the plurality of convex portions are the same. For this reason, the volume change amount of the recessed part adjacent to these deformed convex parts also becomes the same, and the change amount of the flow path area of the flow path formed by this recessed part also becomes the same. In this way, the amount of change in the flow path area of the flow path can be determined with respect to the amount of axial movement of the valve body, so by controlling the amount of axial movement of the valve body, The minute flow rate of the fluid flowing out from the flow path between the two can be adjusted with high accuracy.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing a blood pressure monitor exhaust device according to an embodiment of the flow control device of the present invention. FIG. 2 is a perspective view of the sphygmomanometer exhaust device of FIG. 1 except for the sub-housing.

  Here, FIG. 7 shows an electric sphygmomanometer 10 in which the sphygmomanometer exhaust device 20 as a flow rate adjusting device is used. The electric sphygmomanometer 10 includes a cuff band 11 wound around a part of a human body such as an arm, a wrist, or a finger, a pump 12 that supplies compressed air to the cuff band 11, and a pressure gauge that detects air pressure in the cuff band 11. 13, the sphygmomanometer exhaust device 20 for discharging the air in the cuff belt 11 to the atmosphere at a constant speed through the outlet pipe 14, and the cuff belt 11 by controlling the operation of the pump 12 based on the detection signal from the pressure gauge 13. And a microcomputer 15 that controls the operation of the sphygmomanometer exhaust device 20 to discharge the air from the cuff belt 11 at a constant speed.

  As described above, the sphygmomanometer exhaust device 20 that gradually exhausts the air in the cuff belt 11 includes a yoke 24, a permanent magnet 25, and a drive in the storage space 23 of the main housing 21, as shown in FIGS. The coil 26 and the valve body 27 are housed, and the sub housing 22 covers the opening of the main housing 21.

  The main housing 21 is formed of a resin material in a rectangular tube shape with a bottom. The sub-housing 22 is also made of a resin material, and the sub-housing 22 has a flow port 28 through which air as a fluid flows. Inside the sub-housing 22 at the flow port 28, a flow port protruding end 29 through which the fluid in the flow port 28 flows into the sub-housing 22 is provided. An outer portion of the sub housing 22 at the flow port 28 is connected to the outlet pipe 14 (FIG. 7).

  Even in the state where the main housing 21 and the sub-housing 22 are joined, the communication port 30 (see FIG. 6) is provided at the joined portion. The air flowing through the flow port 28 and flowing into the blood pressure monitor exhaust device 20 from the flow port tip 29 is discharged into the atmosphere through the communication port 30.

  The yoke 24 is made of a magnetic material and is U-shaped. A permanent magnet 25 is fixed inside one piece 31, and a drive coil 26 as a drive device is movable on the other piece 32 in the direction of the central axis O 2. Is inserted. The permanent magnet 25 is arranged on one side with respect to an axis O1 (described later) of the valve element 27, and the drive coil 26 has a central axis O2 located on the other side with respect to the axis O1 of the valve element 27. In the state, it is arranged relative to the permanent magnet 25. A line of magnetic force 33 generated in the permanent magnet 25 flows between the permanent magnet 25 and the other piece 32 of the yoke 24. Accordingly, in the drive coil 26, only the portion 34 </ b> A facing the permanent magnet 25 crosses the magnetic force line 33.

  The drive coil 26 is configured by winding a conducting wire 36 around a substantially square cylindrical bobbin 35, and is arranged so that a portion with a large area becomes a portion 34 </ b> A facing the permanent magnet 25. Further, the valve body 27 is fitted to the bobbin 35 at one end side in the direction of the central axis O2 of the drive coil 26.

  The valve body 27 has its axis O1 aligned with the axis of the flow port 28 of the sub-housing 22, and moves along the axis O1 so that the surface 37 thereof is pressed against the flow port protrusion 29. Get away. The valve body 27 closes the flow port 28 by the surface 37 being pressed against the flow port protrusion 29 (closing operation), and opens the flow port 28 by opening the surface 37 away from the flow port protrusion 29 (open). Operation). By opening and closing the valve body 27, the flow rate of the air flowing through the circulation port 28 is adjusted.

  The bobbin 35 of the drive coil 26 is provided with a pair of coil-side terminals 38 adjacent to the valve body 27 on one end side in the direction of the central axis O2 of the drive coil 26. Both ends of a conducting wire 36 wound around the bobbin 35 are connected to each of the coil side terminals 38. The current flowing through the coil side terminal 38 to the conducting wire 36 of the drive coil 26 crosses the magnetic force line 33 from the permanent magnet 25 when flowing through the portion 34 </ b> A facing the permanent magnet 25. An electromagnetic force in a direction toward the sub-housing 22 is generated in the opposed portion 34A. Due to this electromagnetic force, the valve body 27 is driven along its axis O1 to close, and the surface 37 comes into pressure contact with the flow port protrusion 29 to close the flow port 28.

In order to open the valve body 27, a pair of springs 39 are attached to the bobbin 35 of the drive coil 26 as a biasing member that applies a biasing force in the direction opposite to the electromagnetic force to the driving coil 26. These springs 39 are fixed to an arbitrary position in the axial direction of the drive coil 26 in the bobbin 35, that is, to one end side (the upper end side in FIG. 1) of the bobbin 35 and to the main housing 31. Further, on the other end side (the lower end side in FIG. 1) of the bobbin 35, the guide bar 40 is integrally extended along the central axis O 2 at a position deviated from the central axis O 2 of the drive coil 26. The guide bar 40 is slidably inserted into a guide hole 40 </ b> A formed at the bottom of the main housing 21.

  Accordingly, the drive coil 26 is urged and supported by the main housing 21 via the spring 39 on one end side of the bobbin 35, and is attached to the main housing 21 via the guide bar 40 and the guide hole 40 </ b> A on the other end side of the bobbin 35. It is slid and supported, and is always urged along the central axis O2 in the direction in which the valve element 27 is opened.

  As shown in FIG. 2, each of the springs 39 is formed into a substantially hairpin shape using a material having appropriate elasticity and strength, for example, phosphor bronze, brass, nonmagnetic stainless steel, and the like. On one end side of the spring 39, the coil side positioning hole 41 and the coil side fixing portion 42 are formed in the vicinity of each other, and on the other end side, the housing side positioning hole 43 and the housing side fixing portion 44 are formed in the vicinity of each other. . On the other hand, a pair of coil side positioning projections 45 are formed close to the coil side terminal 38 on one end side of the bobbin 35 of the drive coil 26. The main housing 21 is provided with a housing-side positioning projection 46 and a housing-side terminal 47 close to each other on the joint surface with the sub-housing 22.

  After the coil-side positioning hole 41 of the spring 39 is fitted to the coil-side positioning protrusion 45 of the drive coil 26 and positioned, the coil-side fixing portion 42 of the spring 39 is fixed to the coil-side terminal 38 of the drive coil 26 by soldering or the like. As a result, one end of the spring 39 is fixedly attached to the drive coil 26. Further, after positioning the housing side positioning hole 43 of the spring 39 with the housing side positioning projection 46 of the main housing 21, the housing side fixing portion 44 of the spring 39 is soldered to the housing side terminal 47 of the main housing 21. The other end side of the spring 39 is fixedly attached to the main housing 21.

  As described above, the above-described spring 39 functions as a biasing member that applies a biasing force to the drive coil 26 to open the valve body 27, and also functions as a conduction line for flowing a current through the drive coil 26. . That is, the housing side terminal 47 extends through the main housing 21 from the joint surface with the sub housing 22 to the bottom surface, and the current supplied to the housing side terminal 47 is supplied by the spring 39 and the coil side terminal 38. Then, the electric current flows to the conductive wire 36 of the drive coil 26 to generate an electromagnetic force in the drive coil 26.

  Further, as shown in FIG. 3, the pair of springs 39 are integrally formed by, for example, two connecting portions 48 at the time of manufacture. As shown in FIG. 4, the connecting portion 48 can be cut after the coil side fixing portion 42 of the spring 39 is fixed to the coil side terminal 38 of the drive coil 26 and the spring 39 is attached to the drive coil 26. . The pair of springs 39 are connected by a connecting portion 48 at one end portion including the coil side positioning hole 41 and the coil side fixing portion 42. Accordingly, the pair of springs 39 integrally formed by the connecting portion 48 can be positioned simultaneously when attached to the drive coil 26.

Next, the operation of the blood pressure monitor exhaust device 20 will be described with reference to FIGS. 1 and 7.
By causing a current of a predetermined value to flow through the drive coil 26, an electromagnetic force is generated in the drive coil 26 in a direction for closing the valve element 27. In this state, the electromagnetic force overcomes the biasing force of the spring 39, the valve body 27 is pressed against the flow port protrusion 29, and the flow port 28 is completely closed (fully closed). In this state, air is supplied from the pump 12 into the cuff belt 11, and the pressure in the cuff belt 11 is about 200 mmHg as shown in FIG.

  Thereafter, in order to shift to a decompression process in which the cuff band 11 of the electric sphygmomanometer 10 is gradually decompressed, the current supplied to the drive coil 26 of the sphygmomanometer exhaust device 20 is gradually decreased. Then, the electromagnetic force generated in the drive coil 26 gradually weakens as the current decreases, so that the drive coil 26 gradually moves in the direction of opening the valve element 27 by the biasing force of the spring 39, and the valve element 27 is gradually separated from the flow port tip 29, and the flow port 28 is opened minutely and continuously. As a result, the air in the cuff belt 11 is exhausted into the atmosphere at a very low speed, that is, at a small flow rate, through the flow port 28 of the sphygmomanometer exhaust device 20, and the inside of the cuff belt 11 is gradually decompressed as shown in FIG. .

  The pressure gauge 13 detects a pressure pulsation generated in the cuff zone 11 during the decompression process, and the microcomputer 15 calculates a systolic blood pressure and a diastolic blood pressure from the profile of the change in the pressure pulsation by an oscillometric method.

  As in the sphygmomanometer exhaust device 20 having the above-described configuration, only the portion 34A of the drive coil 26 facing the permanent magnet 25 generates an electromagnetic force across the magnetic force line 33, and the bobbin 35 of the drive coil 26 has an axis. Even if the urging force is received by the spring 39 only at one end in the direction, the movement of the drive coil 26 along the axial direction has a low sliding resistance and is smooth, and the valve body 27 can smoothly exhaust the air at a low speed. realizable.

Next, an assembly procedure of the blood pressure exhaust device 20 will be described.
First, as shown in FIG. 3, in a state where the pair of springs 39 are integrated by the connecting portion 48, the coil-side positioning hole 41 of the spring 39 is fitted into the coil-side positioning protrusion 45 of the drive coil 26 and positioned. Thereafter, the coil side fixing portion 42 of the spring 39 is fixed to the coil side terminal 38 of the drive coil 26 by soldering or the like. Next, the connecting portion 48 is bent and cut from the spring 39, and the pair of springs 39 are mechanically and electrically separated as shown in FIG.

  Next, as shown in FIG. 5, the yoke 24 to which the permanent magnet 25 is fixed is stored in the storage space 23 of the main housing 21. Thereafter, the drive coil 26 to which the spring 39 is attached is stored in the storage space 23 of the main housing 21. At this time, the other piece 32 of the yoke 24 is inserted into the bobbin 35 of the drive coil 26.

  Thereafter, as shown in FIG. 2, the housing side positioning hole 43 of the spring 39 is fitted and positioned in the housing side positioning projection 46 of the main housing 21, and then the housing side fixing portion 44 of the spring 39 is moved to the housing of the main housing 21. The side terminal 47 is fixed by soldering or the like. Finally, as shown in FIGS. 1 and 6, the sub housing 22 is attached to the main housing 21 using screws 49 to complete the blood pressure monitor exhaust device 20.

  As shown in FIGS. 9 to 11, the valve body 27 of the sphygmomanometer exhaust device 20 covers the entire surface of the surface 37 that contacts the flow port protrusion 29 of the flow port 28 in the sub-housing 22. A plurality of convex portions 50 having the same shape are formed. These convex portions 50 have a quadrangular pyramid shape, and are regularly formed at equal intervals of pitches p and t in one direction (the horizontal direction in FIG. 10) and the other direction (vertical direction in FIG. 10) orthogonal thereto. Yes.

  The pitch p and the pitch t are the same in this embodiment, but may be different. Moreover, the hatching part in FIG. 10 shows the location S where the flow port tip 29 faces and contacts on the surface 37 of the valve element 27.

  The plurality of convex portions 50 can be formed, for example, by cutting a plurality of V grooves in a direction orthogonal to each other by machining on the surface of the flat valve body 27. Further, the plurality of convex portions 50 can be integrally formed by a mold when the valve body 27 is formed. Further, the groove angle θ (FIG. 11) of the V groove is, for example, θ = 60 degrees. Further, as shown in FIG. 11, two or more convex portions 50 are in contact with one side (dimension k) in a longitudinal section passing through the axial center of the flow port 28, that is, the axial center O3 of the flow port protruding end 29. A distribution 37 is formed on the surface 37 of the valve body 27. The axis O3 coincides with the axis O1 of the valve body 27 as described above.

In the surface 37 of the valve body 27, as shown in FIG. 9, the recessed part 51 of the communication state is formed adjacent to the some convex part 50. As shown in FIG. The concave portion 51 serves to form a flow path with the flow port protruding end 29 when the convex portion 50 of the valve body 27 comes into contact with the flow port protruding end 29. The air in the circulation port 28 flows into the sphygmomanometer exhaust device 20 through the flow path in a state where the convex portion 50 of the valve body 27 is in contact with the circulation port protrusion 29, and the communication port of the sub-housing 22. 30 (see FIG. 6) is discharged into the atmosphere.

  When the valve body 27 moves in the axial direction and the plurality of convex portions 50 are deformed by being pressed against or separated from the flow port protrusion 29, the volume of the concave portion 51 adjacent to the deformed convex portion 50 also changes. The flow area of the flow path formed by the recess 51 changes. Accordingly, when the valve body 27 is moved in the axial direction within the range of the height h of the convex portion 50 (FIG. 11; for example, h = 0.08 mm) from the position where the convex portion 50 contacts the flow port protrusion 29, the convex portion The flow area is slightly changed by the deformation of the portion 50, and the flow rate of the air discharged through the flow path 30 of the sub-housing 22 into the atmosphere can be finely adjusted. The decompression is fine tuned.

  At this time, since the plurality of convex portions 50 of the valve body 27 have the same shape and are regularly formed, the valve body 27 moves in the axial direction so that these convex portions 50 are pressed against or separated from the flow port projection end 29. When deformed, the amount of deformation of the deformed plurality of convex portions 50 is the same at the location S (FIG. 10) that faces and contacts the flow outlet tip. For this reason, the volume change amount of the concave portion 51 adjacent to the deformed convex portion 50 is also the same in the portion S facing and in contact with the flow port protruding end 29, and the flow path formed by the concave portion 51 and the flow port protruding end 29. The amount of change in the flow area is also the same at the location S that faces and contacts the flow outlet tip 29. Thus, since the amount of change in the flow path area of the flow path is the same in the portion S facing and in contact with the flow port protrusion 29 with respect to the axial movement amount of the valve body 27, the axial direction of the valve body 27 By controlling the amount of movement, the minute flow rate of the air flowing through the flow path formed by the flow port tip 29 and the recess 51 can be adjusted with high accuracy, and a highly accurate blood pressure monitor can be manufactured.

As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.
For example, in the above-described embodiment, the convex portion 50 is formed in the entire area of the surface 37 of the valve body 27, but the convex portion 50 has at least the flow port protrusion 29 on the surface 37 of the valve body 27. What is necessary is just to be formed in the location S which opposes and contacts.

  Further, as shown in FIG. 12, the convex portion 50 of the valve body 27 is distributed so that one or more contacts one side (dimension k) in the longitudinal section passing through the axial center O3 of the flow port protrusion 29. 27 may be formed on the surface 37.

  Furthermore, in the present embodiment, the plurality of convex portions 50 having the same shape in the valve body 27 are formed on the surface 37 of the valve body 27 at regular intervals. (Irregular) may be formed.

  Moreover, the convex part 50 of the valve body 27 may be a triangular pyramid or a cone, and as shown in FIG. 13, a hemisphere (FIG. 13A), a cylinder or a prism (FIG. 13B). )).

  Furthermore, the convex portion 50 gradually increases in cross-sectional area toward a cone having a curved surface curved inward (FIG. 13C), a truncated cone or a truncated pyramid (FIG. 13D), or a tip. It may be a three-dimensional shape (FIG. 13E).

  Moreover, in the said embodiment, although the case where each convex part 50 was the shape (independent protrusion shape) independent in the vertical / horizontal direction on the surface 37 of the valve body 27 was shown, convex part 50B illustrated in FIG. As described above, it may be formed as a ridge that is continuous in one direction on the surface 37 of the valve element 27 in the same cross section. Also in this case, the plurality of protrusions 50B formed as protrusions are arranged in parallel with each other at a constant pitch. In addition, the cross-sectional shape of the convex part 50B is arbitrary, such as a triangle, a semicircle, and a rectangle.

  Further, in the above embodiment, the case where the flow control device is used as the sphygmomanometer exhaust device 20 has been described. However, the flow control device may be used for general purposes other than the sphygmomanometer exhaust device 20. In this case, the drive coil 28 is urged in the direction in which the valve element 37 is closed by the action of the urging force of the spring 39, and the valve element 37 is opened by the action of the electromagnetic force generated in the drive coil 28. You may comprise.

It is sectional drawing which shows the exhaust apparatus for blood pressure monitors which is one Embodiment of the flow control apparatus which concerns on this invention. FIG. 2 is a perspective view showing the sphygmomanometer exhaust device of FIG. 1 excluding a sub-housing. FIG. 2 is a perspective view showing a state immediately after a pair of springs are fixed to a drive coil in the spring and the drive coil of FIG. 1. FIG. 2 is a perspective view showing a state in which a connecting portion is cut from a pair of springs in the spring and the drive coil of FIG. 1. It is a perspective view which shows the state which accommodates the drive coil to which a pair of spring was attached in the main housing. It is a disassembled perspective view which shows the exhaust apparatus for blood pressure monitors of FIG. It is a block diagram which shows the electric blood pressure monitor using the exhaust apparatus for blood pressure monitors of FIG. It is a graph which shows the pressure change in the cuff belt at the time of blood pressure measurement. It is a perspective view which shows the valve body in FIG. It is a top view which shows the valve body of FIG. It is sectional drawing which shows the state which the valve body of FIG. 1 contacted the circulation port protrusion end. It is sectional drawing which shows the other example of the valve body which contacted the circulation port protrusion. It is a side view which shows the modification of the convex part in a valve body. It is a side view which shows the modification of the convex part in a valve body.

Explanation of symbols

20 Exhaust device for blood pressure monitor (flow control device)
21 Main housing 22 Sub housing 26 Drive coil 27 Valve body 28 Flow port 29 Flow port protruding end 37 Surface 50, 50B Protrusion 51 Recess O1 Axle of valve body

Claims (10)

In the valve body in which the surface is pressed against or separated from the tip of the flow port from which the fluid flows out from the flow port, and the flow port is closed or opened,
The valve body according to claim 1, wherein a plurality of convex portions having the same shape are formed on the surface at least at a location in contact with the tip of the flow port. In the valve body in which the surface is pressed against or separated from the tip of the flow port from which the fluid flows out from the flow port, and the flow port is closed or opened,
A plurality of convex portions are formed on the surface at least at a location that contacts the tip of the flow port, and the convex portions are regularly arranged on the surface at least at a location that contacts the tip of the flow port. .   3. The valve body according to claim 1, wherein two or more of the convex portions are in contact with each other on one side in a longitudinal section passing through the axis of the flow port protrusion end.   The said convex part is formed as protrusions, such as a cone, a hemisphere, and a column which became independent in the vertical and horizontal directions, or as a convex line which continued in the same cross section in one direction. The valve body according to any one of the above. A housing in which a flow port through which the fluid flows is formed, and a flow port protruding end from which the fluid flows out from the flow port,
A valve body that is disposed in the housing and has a surface that presses or separates from the tip of the flow port to close or open the flow port to adjust the flow rate of the fluid flowing in the flow port;
A flow rate adjusting device having a drive device disposed in the housing and driving the valve body along its axis to perform a closing operation or an opening operation;
On the surface of the valve body, a plurality of convex portions having the same shape are formed at least at a location in contact with the tip of the flow port.   The flow rate adjusting device according to claim 5, wherein the convex portions of the valve body are regularly arranged on the surface at least at locations where the convex portions come into contact with the tip of the flow port.   7. The flow rate adjusting device according to claim 5, wherein two or more convex portions of the valve body are formed in contact with each other on one side in a longitudinal section passing through the axis of the flow port protruding end.   The said convex part is formed as protrusions, such as a cone, a hemisphere, a pillar, etc. which became independent in the vertical and horizontal directions, or as a convex line | wire continuous in the same cross section in one direction. The flow volume control apparatus in any one of. 9. The flow rate control device according to claim 5, wherein the flow rate control device is used as an exhaust device for a sphygmomanometer that discharges air supplied in a cuff belt wound around a part such as an arm or wrist of a human body. .   A blood pressure monitor using the flow control device according to any one of claims 5 to 9.

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