WO2009128394A1 - 逆止弁構造、ダイヤフラムポンプおよび血圧計 - Google Patents
逆止弁構造、ダイヤフラムポンプおよび血圧計 Download PDFInfo
- Publication number
- WO2009128394A1 WO2009128394A1 PCT/JP2009/057323 JP2009057323W WO2009128394A1 WO 2009128394 A1 WO2009128394 A1 WO 2009128394A1 JP 2009057323 W JP2009057323 W JP 2009057323W WO 2009128394 A1 WO2009128394 A1 WO 2009128394A1
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- space
- valve
- elastic
- pump
- gas
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
- A61B5/0235—Valves specially adapted therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/02141—Details of apparatus construction, e.g. pump units or housings therefor, cuff pressurising systems, arrangements of fluid conduits or circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/0009—Special features
- F04B43/0045—Special features with a number of independent working chambers which are actuated successively by one mechanism
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/1037—Flap valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/14—Check valves with flexible valve members
- F16K15/148—Check valves with flexible valve members the closure elements being fixed in their centre
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/14—Check valves with flexible valve members
- F16K15/16—Check valves with flexible valve members with tongue-shaped laminae
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7838—Plural
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7838—Plural
- Y10T137/7839—Dividing and recombining in a single flow path
- Y10T137/784—Integral resilient member forms plural valves
Definitions
- the present invention relates to a check valve structure, a diaphragm pump, and a blood pressure monitor.
- an arm band with a built-in air bag is wrapped around a part of the living body, and air is sent to the air bag to pressurize it.
- Blood pressure is measured from arterial information obtained by compressing the living body.
- An air pump is used to pressurize the air bag.
- the air pump includes a rubber-like diaphragm that forms a pump chamber in the case, and performs a pumping action by changing the volume of the diaphragm.
- the air pump is provided with a check valve so that the discharged air and the sucked air do not flow in opposite directions. In general, a thin rubber material is used for the check valve.
- the thin-film valve has a structure in which, if it is a discharge valve, the valve is opened by discharge pressure to send air to the adjacent air chamber, and the valve is closed during intake and the air does not return in the reverse direction.
- the valve In the case of an intake valve, the valve is opened by intake pressure (minus) and air is sucked into the pump chamber, and when compressed, the valve is closed and air does not leak.
- the thin-film valve shape includes a cylindrical shape, a thin leaf shape, and an umbrella shape.
- various techniques have been proposed for a thin-film check valve and a pump using the check valve (for example, JP-A-10-131862 (Patent Document 1) and JP-A-11-218244).
- Patent Document 2 Japanese Patent Application Laid-Open No. 2003-139258 (Patent Document 3), Japanese Patent Application Laid-Open No. 2002-5029 (Patent Document 4), Japanese Patent Application Laid-Open No. 2003-269337 (Patent Document 5)).
- Patent Document 1 In the small pump described in Japanese Patent Laid-Open No. 10-131862 (Patent Document 1), a cylindrical discharge valve is provided at the center between a plurality of diaphragms, and an intake valve for each diaphragm is provided. The mold valve is sealed with a tapered shape to prevent air leakage.
- the discharge valve and the intake valve described in Japanese Patent Laid-Open No. 11-218244 (Patent Document 2) are umbrella-type, and ribs are provided on the outer periphery to prevent leakage from the film end.
- Patent Document 3 In the check valve described in Japanese Patent Application Laid-Open No. 2003-139258 (Patent Document 3), the discharge valve and the intake valve are provided with convex portions or concave portions to be fitted to prevent positioning and floating to prevent air leakage. Yes.
- the small pump described in Japanese Patent Laid-Open No. 2002-5029 has a configuration in which an intake hole is formed in a driving body connected to the bottom of the diaphragm, and a thin-film intake valve is provided at the bottom of the diaphragm.
- the diaphragm pump described in Japanese Patent Application Laid-Open No. 2003-269337 has a configuration in which an intake valve is formed into a thin film shape or a leaf shape, and a plurality of intake valves and a plurality of diaphragms are integrated. A convex portion surrounding the intake port is provided on the lower surface of the intake valve to prevent leakage.
- Patent Document 1 In the small pump described in JP-A-10-131862 (Patent Document 1), it is very difficult to insert and assemble a soft thin-film cylindrical valve into the hole when the pump is assembled, and the valve shape is also complicated.
- Patent Document 2 In the umbrella valve described in Japanese Patent Application Laid-Open No. 11-218244 (Patent Document 2), the O-ring hermeticity of the umbrella mounting portion becomes insufficient, and there is a problem in stability and durability after the mounting.
- Patent Document 3 In the check valve described in Japanese Patent Laid-Open No. 2003-139258 (Patent Document 3), the same number of intake valves is required for a plurality of diaphragms, which increases the number of parts and the number of assembly steps.
- Patent Document 4 since the drive body connected to the bottom of the diaphragm is provided with a valve, the drive body operates when the pump is driven. Since it operates with the drive body, the valve deformation is large and air leakage is likely to occur.
- the diaphragm pump described in Japanese Patent Application Laid-Open No. 2003-269337 (Patent Document 5) has a feature that the number of parts is reduced by integrating the intake valve with the diaphragm, but since there is no configuration for pressing the periphery of the valve, The valve is easily deformed and easily leaks.
- the check valve structure according to the present invention is a valve structure that allows the flow of fluid from the first space to the second space and prohibits the flow in the reverse direction.
- the check valve structure is disposed between the first space and the second space, and includes a partition wall having a communication hole that communicates the first space and the second space.
- the elastic membrane body which covers the 2nd space side of a communicating hole and prevents the back flow of a fluid is provided.
- it has the wall part surrounding a communicating hole and is provided with the elastic member which hold
- transformation by distortion of an elastic film body is provided by restrict
- the elastic member is formed so that the wall portion has a thickness larger than the thickness of the elastic film body.
- the check valve structure further includes a clamping member that clamps an elastic member between the check wall and the partition wall.
- the surface of the elastic member is in close contact with the surface of the partition wall on the second space side, and the back surface opposite to the surface is in close contact with the clamping member.
- the clamping member has a protruding portion in which the clamping member protrudes toward the partition wall.
- the protrusion and the wall are formed to have a dimensional relationship in which the protrusion is press-fitted into a space surrounded by the wall.
- a chamfering process is applied to the projecting end portion of the projecting portion on the surface facing the wall portion.
- the diaphragm pump according to the present invention is a pump that transports gas by changing the volume of the pump chamber.
- the diaphragm pump includes an intake valve that allows gas to flow into the pump chamber and a discharge valve that allows gas to flow out of the pump chamber. Any of the above check valve structures is used for at least one of the intake valve and the discharge valve.
- the sphygmomanometer according to the present invention includes a cuff that is attached to a blood pressure measurement site of a measurement subject and has a gas bag filled with gas.
- the above-described diaphragm pump is provided for transferring gas to the gas bag.
- the pressure detection part which detects the pressure in a cuff is provided.
- the measurement part which measures a to-be-measured person's blood pressure from the pressure value detected by the pressure detection part is provided.
- the check valve structure of the present invention deformation due to distortion of the elastic film body that prevents back flow of fluid is suppressed. That is, the check valve is formed so that the valve shape is not easily deformed due to distortion. Therefore, the valve shape can be maintained at the time of assembly or pump operation, and deformation due to distortion of the thin-film check valve can be suppressed. Therefore, the close contact state between the valve and the air hole is difficult to change, and a decrease in pump efficiency due to air leakage can be suppressed, so that a stable pump operation is possible.
- FIG. 2 is a schematic cross-sectional view taken along the line II-II shown in FIG.
- FIG. 3 is a schematic cross-sectional view taken along the line III-III shown in FIG.
- It is a plane schematic diagram of the diaphragm pump which expands and shows the intake valve periphery.
- It is a cross-sectional schematic diagram of the diaphragm pump which expands and shows the periphery of an intake valve.
- each component is not necessarily essential for the present invention unless otherwise specified.
- the above number is an example, and the scope of the present invention is not necessarily limited to the number, amount, etc.
- FIG. 1 is a schematic plan view showing a configuration of a diaphragm pump having a check valve structure of the present invention.
- FIG. 2 is a schematic cross-sectional view taken along the line II-II shown in FIG. 3 is a schematic cross-sectional view taken along the line III-III shown in FIG.
- a motor 2 which is a small DC motor, is provided below the diaphragm pump 1.
- An output shaft 3 that is rotated by the rotational motion of the motor 2 is attached to the motor 2.
- the output shaft 3 extends to the inside of the lower case 4 of the diaphragm pump 1.
- the collar 5 is fixed to the end of the output shaft 3.
- the collar 5 rotates together with the output shaft 3.
- a drive shaft 6 is fixed to the collar 5.
- the base end, which is one end portion fixed to the collar 5 of the drive shaft 6, is located away from the extension line of the rotation center of the output shaft 3.
- the extension line of the center axis intersects the extension line of the rotation center of the output shaft 3. Therefore, the drive shaft 6 is inclined with respect to the output shaft 3.
- the drive body 7 is rotatably inserted in the front end side of the drive shaft 6.
- the driving body 7 has a circular planar shape.
- Three through holes 8 are formed in the driving body 7 at intervals of 120 °.
- a cylindrical support portion 9 extending in the direction in which the drive shaft 6 extends is formed below the drive body 7, and the distal end portion of the drive shaft 6 is rotatable in a hole provided in the center of the support portion 9. Is inserted.
- An upper case 10 is disposed so as to surround the drive body 7.
- the upper case 10 is fixed to the upper end portion of the lower case 4 at its lower end portion by a screw action or the like.
- a diaphragm body 11 is provided on the upper side of the upper case 10.
- the diaphragm body 11 is formed of an elastic material such as soft and thin rubber, and is formed in a disk shape.
- bell-shaped pump chambers 12 formed at equal angular intervals of 120 ° are formed below the diaphragm body 11.
- the pump chamber 12 is formed so as to be surrounded by a diaphragm portion 15 provided to be extendable and a drive portion 13 that expands and contracts the diaphragm portion 15 to increase or decrease the volume of the pump chamber 12.
- the drive unit 13 is provided below the pump chamber 12.
- a head portion 14 is formed at the tip of the drive portion 13 with a thin neck portion interposed.
- the diaphragm body 11 is assembled to the drive body 7 such that the head 14 passes through the through hole 8 formed in the drive body 7 and the neck portion is positioned inside the through hole 8.
- a valve housing 16 is provided on the upper side of the diaphragm body 11.
- a gas collection 17 is provided on the upper side of the valve housing 16.
- An intake valve 20 and a discharge valve 30 are arranged so as to be sandwiched between the valve housing 16 and the gas collection member 17.
- the gas transported by the diaphragm pump 1 flows from the exhaust part 42 to the outside via the air chamber 41 formed inside the gas collection 17.
- FIG. 4 and FIG. 6, which will be described later, show a plan view of the diaphragm pump 1 in a cross section in which the intake valve 20 and the discharge valve 30 are provided.
- FIG. 4 is a schematic plan view of the diaphragm pump that shows the periphery of the intake valve in an enlarged manner.
- FIG. 5 is a schematic cross-sectional view of the diaphragm pump showing the periphery of the intake valve in an enlarged manner.
- the intake valve 20 that allows gas to flow into the pump chamber 12 is formed so as to surround the elastic film body 21 and the elastic film body 21, and the elasticity that holds the elastic film body 21.
- a member 22 is formed so as to surround the elastic film body 21 and the elastic film body 21, and the elasticity that holds the elastic film body 21.
- the elastic member 22 has a wall portion 22c, and the elastic film body 21 is provided in a space 25 surrounded by the wall portion 22c.
- the surface 22 a of the elastic member 22 is in close contact with the space 16 side surface 16 a of the valve housing 16.
- a back surface 22 b opposite to the front surface 22 a of the elastic member 22 is in close contact with the surface 17 b of the gas collection 17 on the space 25 side.
- the elastic member 22 is sandwiched between the valve housing 16 and the gas collection 17.
- the gas collection member 17 has a function as a clamping member that clamps the elastic member 22 with the valve housing 16.
- the space surrounded by the lower case 4, the upper case 10, and the diaphragm main body 11 forms an internal space of the diaphragm pump 1.
- An intake passage 18 is formed at one or a plurality of locations of at least one of the lower case 4 and the upper case 10, and communicates the internal space of the diaphragm pump 1 with the outside of the diaphragm pump 1. The air flows into the internal space of the diaphragm pump 1 from outside the system via the intake passage 18.
- the inner space of the diaphragm pump 1 and the space 25 surrounded by the wall 22c are separated by the upper case 10, the diaphragm main body 11, and the valve housing 16, as shown in FIG.
- the upper case 10, the diaphragm main body 11, and the valve housing 16 are respectively formed with communication holes 10 a, 11 a, and 23 for communicating the inner space of the diaphragm pump 1 with the space 25.
- the valve housing 16 is included in a partition wall that separates the internal space of the diaphragm pump 1 as the first space and the space 25 as the second space.
- the valve housing 16 is disposed between the internal space of the diaphragm pump 1 and the space 25.
- a communication hole 23 is formed in the valve housing 16 to communicate the internal space of the diaphragm pump 1 with the space 25.
- the elastic film body 21 covers the communication hole 23 formed in the valve housing 16 from the space 25 side.
- the wall 22 c of the elastic member 22 is formed so as to surround the communication hole 23.
- the gas collection 17 as a clamping member that clamps the elastic member 22 together with the valve housing 16 has a protruding portion 24 in which a part of the gas collection 17 protrudes toward the valve housing 16 side.
- the protruding portion 24 protrudes into the space 25 formed by being surrounded by the wall portion 22 c of the elastic member 22.
- the protrusion 24 is fitted into the space 25 above the elastic film body 21 by press fitting.
- the side wall 24 c of the protrusion 24 is in contact with the wall 22 c of the elastic member 22.
- the protruding portion 24 is formed by projecting the gas collection member 17, which is a member facing the valve housing 16 with which the elastic film body 21 contacts, with a space 25 therebetween, into the space 25.
- the protrusion 24 is formed by projecting the gas collection member 17 as one member among the members sandwiching the elastic member 22 toward the valve housing 16 as the other member.
- a chamfered portion 24b is formed on the periphery of the protruding portion 24a, which is the tip from which the protruding portion 24 protrudes into the space 25.
- the chamfered portion 24 b is formed at the tip of the side wall 24 c that contacts the wall portion 22 c of the elastic member 22.
- a chamfered portion 24 b is formed on the protruding end portion 24 a of the protruding portion 24 by chamfering a side wall 24 c that is a surface facing the wall portion 22 c of the elastic member 22.
- the elastic member 22 is formed so as to have a thickness larger than the thickness of the elastic film body 21 in the wall portion 22c.
- the elastic film body 21 and the elastic member 22 can be formed so that the thickness of the elastic member 22 in the wall portion 22c is about five times the thickness of the elastic film body 21.
- the thickness of the elastic film body 21 can be 0.3 mm, and the thickness of the elastic member 22 can be 1.5 mm.
- An air passage 29 a is formed inside the protrusion 24.
- the air passage 29 a communicates with the air passage 29 b shown in FIG. 4 through a not-shown air passage formed inside the gas collection 17.
- the space 25 and the pump chamber 12 include ventilation paths 29 a and 29 b formed in the gas collection 17, a ventilation hole 29 c formed in the elastic member 32 shown in FIG. 7 to be described later, and a ventilation hole 29 d formed in the valve housing 16. It is structured to communicate via.
- FIG. 6 is a schematic plan view of the diaphragm pump showing the periphery of the discharge valve in an enlarged manner.
- FIG. 7 is a schematic cross-sectional view of a diaphragm pump showing the periphery of the discharge valve in an enlarged manner.
- the discharge valve 30 that allows gas to flow out from the pump chamber 12 is formed to surround the elastic film body 31 and the elastic film body 31, and to hold the elastic film body 31. 32.
- the elastic member 32 has a wall portion 32c, and the elastic film body 31 is provided in a space 35 surrounded by the wall portion 32c.
- the surface 32 a of the elastic member 32 is in close contact with the surface 16 a on the space 35 side of the valve housing 16.
- the back surface 32 b opposite to the front surface 32 a of the elastic member 32 is in close contact with the surface 17 b of the gas collection 17 on the space 35 side.
- the elastic member 32 is sandwiched between the valve housing 16 and the gas collection 17.
- the gas collection 17 has a function as a clamping member that clamps the elastic member 32 with the valve housing 16.
- the pump chamber 12 and the space 35 surrounded by the wall 32c are separated by a valve housing 16, as shown in FIG.
- a communication hole 33 for communicating the pump chamber 12 and the space 35 is formed in the valve housing 16.
- the valve housing 16 is a partition wall that separates the pump chamber 12 as the first space and the space 35 as the second space.
- the valve housing 16 is disposed between the pump chamber 12 and the space 35.
- the elastic film body 31 covers the communication hole 33 formed in the valve housing 16 from the space 35 side.
- the wall portion 32 c of the elastic member 32 is formed so as to surround the communication hole 33.
- the gas collection 17 as a clamping member that clamps the elastic member 32 together with the valve housing 16 has a protruding portion 34 in which a part of the gas collection 17 protrudes toward the valve housing 16 side.
- the protrusion 34 protrudes into the space 35 formed by being surrounded by the wall 32 c of the elastic member 32.
- the protrusion 34 is fitted into the space 35 above the elastic film body 31 by press fitting.
- the side wall 34 c of the protrusion 34 is in contact with the wall 32 c of the elastic member 32.
- the projection 34 is formed by projecting the gas collection 17, which is a member facing the valve housing 16 with which the elastic film body 31 is in contact with the space 35, into the space 35.
- the protruding portion 34 is formed by projecting the gas collection member 17, which is one member among the members that sandwich the elastic member 32, toward the valve housing 16 that is the other member.
- a chamfered portion 34b is formed on the periphery of the protruding end portion 34a, which is the tip from which the protruding portion 34 protrudes into the space 35.
- the chamfered portion 34 b is formed at the tip of the side wall 34 c that contacts the wall portion 32 c of the elastic member 32.
- a chamfered portion 34 b is formed on the protruding end portion 34 a of the protruding portion 34 by chamfering a side wall 34 c that is a surface facing the wall portion 32 c of the elastic member 32.
- the elastic member 32 is formed so as to have a thickness larger than the thickness of the elastic film body 31 in the wall portion 32c.
- the elastic film body 31 and the elastic member 32 can be formed so that the thickness of the elastic member 32 in the wall portion 32 c is about five times the thickness of the elastic film body 31.
- the thickness of the elastic film body 31 can be 0.3 mm, and the thickness of the elastic member 32 can be 1.5 mm.
- the operation of the diaphragm pump 1 of the present embodiment will be described.
- the drive shaft 6 that is an inclined shaft rotates.
- the drive body 7 is assembled to the drive shaft 6 and is assembled to the head 14 of the drive unit 13 of each pump chamber 12. Therefore, the assembly of the drive body 7 and the head 14 of the drive unit 13 of each pump chamber 12 vibrates in the vertical direction with a phase difference of 120 ° by the rotation of the drive shaft 6.
- the diaphragm portion 15 is expanded and contracted by the vibration in the vertical direction of the driving portion 13 to periodically change the volume of the pump chamber 12. That is, when the drive unit 13 moves downward, the volume of the pump chamber 12 increases, and when the drive unit 13 moves upward, the volume of the pump chamber 12 decreases.
- the inside of the pump chamber 12 is depressurized.
- the elastic film body 31 that is the valve body of the discharge valve 30 comes into close contact with the surface 16 a of the valve housing 16 and the discharge valve 30 is closed.
- the elastic film body 21, which is the valve body of the intake valve 20 moves into the space 25 by being elastically deformed by a change in pressure inside the pump chamber 12. As a result, the intake valve 20 is opened, and air flows into the pump chamber 12 via the intake valve 20.
- FIG. 8 is an enlarged schematic cross-sectional view showing a state in which the elastic film body is closed.
- FIG. 9 is an enlarged schematic cross-sectional view showing a state in which the elastic film body is opened.
- the diaphragm pump 1 transports gas by the volume change of the pump chamber 12 as described above.
- the air that has flowed out of the pump chamber 12 via the discharge valve 30 flows from the exhaust section 42 to the outside through the air chamber 41 formed inside the gas collection 17.
- the intake valve 20 acts as a check valve that allows a gas flow from the inner space of the diaphragm pump 1 toward the pump chamber 12 and prohibits a flow in the opposite direction.
- the discharge valve 30 functions as a check valve that allows a gas flow from the pump chamber 12 toward the exhaust part 42 and prohibits a flow in the opposite direction.
- Each pump chamber 12 performs a pumping action once while the drive body 7 makes one rotation, but the diaphragm pump 1 as a whole performs three pumping actions sequentially with a constant phase difference, and pulsation of the air flow is caused. Smaller and better operating efficiency.
- a pump chamber 12 is formed integrally with the motor 2, and a plurality of pump chambers 12 are arranged around the rotation center of the output shaft 3, and a driving body is provided between the motor 2 and the pump chamber 12. 7 is arranged. Therefore, the pump device and the motor 2 are integrated, and the shape of the diaphragm pump 1 becomes very small.
- the shape of the thin-film check valve (that is, the elastic film bodies 21 and 31) is likely to be distorted when the diaphragm pump 1 is assembled or operated.
- the close contact state between the elastic film bodies 21 and 31 and the valve housing 16 changes to cause air leakage, resulting in a problem that the pump efficiency is lowered during the pump operation.
- the protrusions 24 and 34 are formed in the gas collection 17 as deformation suppressing portions that suppress deformation due to distortion of the elastic film bodies 21 and 31. Since the protrusions 24 and 34 are fitted in the spaces 25 and 35, respectively, displacement of the walls 22c and 32c formed so as to surround the communication holes 23 and 33 and the elastic film bodies 21 and 31 is limited. Therefore, distortion of the shape of the elastic members 22 and 32 is suppressed. As a result, since deformation due to distortion of the elastic film bodies 21 and 31 can be suppressed, it is possible to suppress a decrease in efficiency of the diaphragm pump 1 due to air leakage.
- FIG. 10 is a partial cross-sectional schematic diagram showing the shape of the elastic member.
- a bead 26 which is a linear protrusion, is formed on the back surface 22 b that is a surface that is in close contact with the gas collection 17 of the elastic member 22.
- the bead 26 is crushed and comes into close contact with the gas collection 17, so that the gap between the elastic member 22 and the gas collection 17 Leakage can be suppressed.
- the assembly accuracy of the diaphragm pump 1 can be improved.
- the elastic film bodies 21 and 31 and the elastic members 22 and 32 can be formed of an elastic material such as rubber.
- the elastic material include NBR (nitrile rubber), CR (chloroprene rubber), EPDM (ethylene propylene rubber), TPE (thermoplastic elastomer), and the like.
- the valve housing 16 and the gas collection 17 to which the elastic members 22 and 32 are in close contact can be formed of a resin material.
- the resin material for example, ABS (acrylonitrile / butadiene / styrene copolymer synthetic resin), PS (polystyrene resin), POM (polyoxymethylene resin) and the like can be used.
- the intake valve 20 of the present embodiment allows a gas flow from the inner space of the diaphragm pump 1 to the pump chamber 12 and prohibits a flow in the opposite direction.
- the intake valve 20 is disposed between the inner space of the diaphragm pump 1 and the space 25, and includes a valve housing 16 in which a communication hole 23 that connects the inner space of the diaphragm pump 1 and the space 25 is formed.
- the intake valve 20 includes an elastic film body 21 that covers the space 25 side of the communication hole 23 and prevents the backflow of gas.
- the intake valve 20 includes a wall portion 22 c that surrounds the communication hole 23 and includes an elastic member 22 that holds the elastic film body 21.
- the intake valve 20 further includes a gas collection member 17 that holds the elastic member 22 between the intake valve 20 and the valve housing 16.
- the surface 22 a of the elastic member 22 is in close contact with the surface 16 a on the space 25 side of the valve housing 16, and the back surface 22 b on the side opposite to the surface 22 a is in close contact with the gas collection 17.
- the gas collection 17 has a projection 24 that the gas collection 17 projects to the valve housing 16 side.
- the discharge valve 30 of the present embodiment has a check valve structure that allows a gas flow from the pump chamber 12 toward the exhaust section 42 and prohibits a flow in the opposite direction.
- the discharge valve 30 includes a valve housing 16 that is disposed between the pump chamber 12 and the space 35 and in which a communication hole 33 that communicates the pump chamber 12 and the space 35 is formed.
- the discharge valve 30 includes an elastic film body 31 that covers the space 35 side of the communication hole 33 and prevents the backflow of gas.
- the discharge valve 30 includes a wall portion 32 c that surrounds the communication hole 33 and includes an elastic member 32 that holds the elastic film body 31.
- the discharge valve 30 further includes a gas collection member 17 that holds the elastic member 32 between the discharge housing 30 and the valve housing 16.
- the surface 32 a of the elastic member 32 is in close contact with the surface 16 a on the space 35 side of the valve housing 16, and the back surface 32 b on the side opposite to the surface 32 a is in close contact with the gas collection 17.
- the gas collection 17 has a projection 34 that the gas collection 17 projects to the valve housing 16 side.
- the walls of the elastic members 22 and 32 formed so as to surround the communication holes 23 and 33 and the elastic film bodies 21 and 31 by fitting the protrusions 24 and 34 into the spaces 25 and 35, respectively. Since the portions 22c and 32c can be limited in displacement relative to the valve housing 16 due to deformation at the time of molding or transportation / assembly, the distortion of the shape of the elastic members 22 and 32 is suppressed. Is done. Therefore, the deformation
- the valve shapes of the intake valve 20 and the discharge valve 30 can be maintained even when the diaphragm pump 1 is assembled or operated, and deformation of the elastic film bodies 21 and 31 that are soft and easily deformed rubber-like thin films is suppressed. Can do. That is, the intake valve 20 and the discharge valve 30 are formed so that the valve shape is not easily deformed. Therefore, the contact state of the elastic film bodies 21 and 31 to the valve housing 16 in which the communication holes 23 and 33 for allowing air to pass is hardly changed.
- the spaces 25 and 35 can be formed in a cylindrical shape in which the planar shape of the surrounding wall portions 22c and 32c is circular. If it does in this way, the shape of the projection parts 24 and 34 corresponding to the wall parts 22c and 32c will be cylindrical, and it will be made to fit, and it will leak from the elastic members 22 and 32 around the elastic film bodies 21 and 31. Can be prevented.
- the protrusions 24 and 34 and the walls 22c and 32c are formed so that the protrusions 24 and 34 have a dimensional relationship in which the protrusions 24 and 34 are press-fitted into the spaces 25 and 35. The prevention effect is further improved. Further, by adopting the above-described structure, air leakage from the spaces 25 and 35 surrounded by the wall portions 22c and 32c can be prevented, so that the bead 26 shown in FIG. 10 can be dispensed with.
- the protrusions 24 and 34 are formed in the gas collection 17 that sandwiches the elastic members 22 and 32 with the valve housing 16. Therefore, when the gas collection 17 is attached to the valve housing 16, the protrusions 24 and 34 can be fitted into the spaces 25 and 35, so that a process for attaching the protrusions 24 and 34 is not particularly required. Moreover, when forming the gas collection 17 with a resin member, the projection parts 24 and 34 can be shape
- the intake valve 20 having the elastic film body 21 and the discharge valve 30 having the elastic film body 31 can be integrally formed.
- the elastic member 22 and the elastic member 32 can be integrally formed of a sheet-like elastic material, and a part of the sheet-like elastic material can be thinned to form the elastic film bodies 21 and 31. In this way, a single integrated valve element can be used for a plurality of diaphragms, so that the number of parts, assembly man-hours, and cost can be reduced.
- the intake valve 20 and the discharge valve 30 can be configured in the same shape. In this way, since the productivity of the valve body can be improved, the cost can be further reduced.
- the elastic member 22 is formed so that the wall portion 22c has a thickness larger than the thickness of the elastic film body 21.
- the elastic member 32 is formed so as to have a thickness larger than the thickness of the elastic film body 31 in the wall portion 32c. In this way, since the strength of the elastic members 22 and 32 can be improved, even if the protrusions 24 and 34 are press-fitted into the spaces 25 and 35 formed in the elastic members 22 and 32, The deformation of the elastic members 22 and 32 can be suppressed.
- the side walls 24c, 34c of the protrusions 24, 34 can be brought into contact with the wall portions 22c, 32c.
- the elastic members 22 and 32 and the projections 24 and 34 can be brought into surface contact, air leakage from the gap between the elastic members 22 and 32 and the projections 24 and 34 can be further suppressed.
- the protrusions 24 and 34 are formed so as to be in surface contact with the entire circumference of the walls 22c and 32c that form the side surfaces of the spaces 25 and 35, the leakage of the check valve can be further suppressed.
- the chamfered portions 24b and 34b are formed on the protruding end portions 24a and 34a of the projecting portions 24 and 34 by chamfering the side walls 24c and 34c which are the surfaces facing the wall portions 22c and 32c. Yes. In this way, since the protrusions 24 and 34 can be easily inserted and fitted into the spaces 25 and 35, the productivity can be further improved.
- a check valve structure is used for the intake valve 20 that allows gas to flow into the pump chamber 12 and the discharge valve 30 that allows gas to flow out from the pump chamber 12.
- the diaphragm pump 1 transports gas by changing the volume of the pump chamber 12.
- the intake valve 20 and the discharge valve 30 are formed so that the contact state between the elastic film bodies 21 and 31 and the valve housing 16 is difficult to change. The decrease can be suppressed. Therefore, the diaphragm pump 1 can be stably operated.
- the diaphragm pump 1 is provided with three pump chambers 12, and an example in which three intake valves 20 and three discharge valves 30 for flowing gas into and out of the pump chamber 12 are also provided.
- the number of intake valves 20, discharge valves 30, and pump chambers 12 is not limited to this. Providing a larger number of pump chambers 12 is advantageous because it can reduce pump ripple and reduce noise generated by the pump.
- a sphygmomanometer 300 includes a main body 301 in which a blood pressure measurement control device is incorporated, a cuff 302 for a sphygmomanometer, and an air tube 312 connecting the main body 301 and the cuff 302.
- the cuff 302 has a compression air bag 309 that is filled and stored with air sent from the air pump 210 and that is used to compress the artery of the measurement site (upper arm). Further, the cuff 302 is provided with a compression air bag 309 on the inner surface side thereof, and a band-like band 310 for mounting on a measurement site (upper arm), and a hook-and-loop fastener 311 for winding and fixing the band 310 around the upper arm.
- a display 303 and an operation unit 304 are provided on the outer surface of the main body 301.
- a pressure sensor 305 as a pressure detection unit that detects the pressure in the cuff 302, an air pump 210 that transfers gas (air) to the compression air bag 309, and an air valve 207 are provided inside the main body 301.
- a CPU 308 that controls devices such as the pressure sensor 305, the air pump 210, and the air valve 207 and obtains the blood pressure of the person to be measured from the pressure value detected by the pressure sensor 205 is provided inside the main body 301. Yes.
- the cuff 302 when measuring the blood pressure of the measurement subject, the cuff 302 is attached to the blood pressure measurement site (upper arm) of the measurement subject.
- the air valve 207 is closed, and the pressure air bag 309 is pressurized so that all the air discharged from the air pump 210 flows out to the pressure air bag 309.
- the air valve 207 is opened, and the air in the compression air bag 309 is discharged to the outside through the air valve 207 to depressurize the compression air bag 309.
- the sphygmomanometer 300 can include the above-described diaphragm pump 1 as the air pump 210 that transfers gas (air) to the compression air bladder 309. Diaphragm pump 1 is able to operate stably because a reduction in pump efficiency due to air leakage is suppressed, and thus stable operation of sphygmomanometer 300 including diaphragm pump 1 becomes possible.
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Cardiology (AREA)
- Mechanical Engineering (AREA)
- Vascular Medicine (AREA)
- Medical Informatics (AREA)
- General Health & Medical Sciences (AREA)
- Biophysics (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Pathology (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physiology (AREA)
- Ophthalmology & Optometry (AREA)
- Reciprocating Pumps (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Check Valves (AREA)
Abstract
Description
Claims (7)
- 第一空間から第二空間へ向かう流体の流れを許容するとともに、その逆方向への流れを禁止する、逆止弁構造において、
前記第一空間と前記第二空間との間に配置されており、前記第一空間と前記第二空間とを連通する連通孔(23,33)が形成された隔壁(16)と、
前記連通孔(23,33)の前記第二空間側を被覆して流体の逆流を妨げる弾性膜体(21,31)と、
前記連通孔(23,33)を取り囲む壁部(22c,32c)を有し、前記弾性膜体(21,31)を保持する弾性部材(22,32)と、
前記壁部(22c,32c)の位置ずれを制限することで前記弾性膜体(21,31)の歪みによる変形を抑制する変形抑制部(24,34)とを備える、逆止弁構造。 - 前記壁部(22c,32c)において前記弾性膜体(21,31)の厚みよりも大きな厚みを有するように、前記弾性部材(22,32)が形成されている、請求の範囲第1項に記載の逆止弁構造。
- 前記隔壁(16)との間で前記弾性部材(22,32)を挟持する挟持部材(17)をさらに備え、
前記弾性部材(22,32)の表面(22a,32a)は前記隔壁(16)の前記第二空間側の面(16a)に密着しており、前記表面(22a,32a)と反対側の裏面(22b,32b)は前記挟持部材(17)に密着しており、
前記挟持部材(17)は、前記隔壁(16)側に突起した突起部(24,34)を有し、
前記壁部(22c,32c)で囲まれる空間(25,35)に前記突起部(24,34)を嵌合することで前記弾性膜体(21,31)の歪みによる変形を抑制する、請求の範囲第1項に記載の逆止弁構造。 - 前記突起部(24,34)と前記壁部(22c,32c)とは、前記突起部(24,34)が前記空間(25,35)に圧入嵌合される寸法関係を有するように形成されている、請求の範囲第3項に記載の逆止弁構造。
- 前記突起部(24,34)の突端部(24a,34a)には、前記壁部(22c,32c)に面する側の面(24c,34c)に面取り加工が施されている、請求の範囲第3項に記載の逆止弁構造。
- ポンプ室(12)の容積変化により気体を輸送するダイヤフラムポンプ(1)であって、
前記ポンプ室(12)内へ気体を流入させる吸気弁(20)と、
前記ポンプ室(12)から気体を流出させる吐出弁(30)とを備え、
前記吸気弁(20)と前記吐出弁(30)との少なくともいずれか一方に、請求の範囲第1項から第5項のいずれかに記載の逆止弁構造が用いられている、ダイヤフラムポンプ(1)。 - 被測定者の血圧測定部位に装着され、気体が充填される気体袋(309)を有するカフ(302)と、
前記気体袋(309)に気体を移送させる、請求の範囲第6項に記載のダイヤフラムポンプ(1)と、
前記カフ(302)内の圧力を検出する圧力検出部(305)と、
前記圧力検出部(305)によって検出された圧力値から被測定者の血圧を測定する測定部(308)と、を備える、血圧計(300)。
Priority Applications (3)
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DE200911000908 DE112009000908B4 (de) | 2008-04-16 | 2009-04-10 | Rückschlagventilstruktur, Membranpumpe und Blutdruckmessgerät |
CN2009801129816A CN102099606B (zh) | 2008-04-16 | 2009-04-10 | 止回阀结构、隔膜泵以及血压计 |
US12/937,548 US8858452B2 (en) | 2008-04-16 | 2009-04-10 | Check valve structure, diaphragm pump, and sphygmomanometer |
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JP2008-106821 | 2008-04-16 | ||
JP2008106821A JP5223436B2 (ja) | 2008-04-16 | 2008-04-16 | 逆止弁構造、ダイヤフラムポンプおよび血圧計 |
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JP (1) | JP5223436B2 (ja) |
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DE (1) | DE112009000908B4 (ja) |
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US8858452B2 (en) | 2014-10-14 |
DE112009000908T5 (de) | 2011-03-10 |
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JP5223436B2 (ja) | 2013-06-26 |
RU2456497C1 (ru) | 2012-07-20 |
CN102099606A (zh) | 2011-06-15 |
US20110028853A1 (en) | 2011-02-03 |
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