US20110091340A1 - Reciprocating pump and check valve - Google Patents
Reciprocating pump and check valve Download PDFInfo
- Publication number
- US20110091340A1 US20110091340A1 US12/901,093 US90109310A US2011091340A1 US 20110091340 A1 US20110091340 A1 US 20110091340A1 US 90109310 A US90109310 A US 90109310A US 2011091340 A1 US2011091340 A1 US 2011091340A1
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- Prior art keywords
- body portion
- pump
- valve
- liquid
- reciprocating
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Classifications
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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
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/04—Pumps having electric drive
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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
- F04B53/1077—Flow resistance valves, e.g. without moving parts
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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]
- Y10T137/7904—Reciprocating valves
- Y10T137/7922—Spring biased
- Y10T137/7929—Spring coaxial with valve
Definitions
- Embodiments described herein relate to a reciprocating pump which introduces a liquid into a pump chamber from a tank, etc. through a pipe and a suction valve and discharges the liquid from the pump chamber through a discharge valve and a pipe by reciprocating movement of a reciprocating member driven by an actuation means, and a check valve used for the reciprocating pump.
- a reciprocating pump introduces a liquid into a pump chamber through a suction valve and discharges the liquid from the pump chamber through a discharge valve by reciprocating movement of a reciprocating member facing the pump chamber.
- the suction valve and the discharge valve each include: a body portion having therein a flow path for a liquid; a valve seat portion provided at an entrance side of the flow path of the body portion and having therein a hole through which the liquid flows; a valving element provided in the body portion and able to open and close the hole of the valve seat portion; and a spring provided in the body portion for pressing the valving element into the hole of the valve seat portion.
- the spring has projections, which are formed on an outer circumferential portion of its surface to project toward the inner wall of the body portion.
- the reciprocating pump according to the aspect is suitable for downsizing, because the use of a spring in the suction valve and the discharge valve improves the checking performance in the suction step and the discharge step and hence improves the pump efficiency.
- the spring may be made of resin, which enables the pump to be used with no problem even for delivering a chemical liquid having metal corrosivity.
- the suction valve and the discharge valve may be connected to a pump head in parallel with each other such that they protrude from the pump head in a direction of a central axis of the pump head.
- the suction valve and the discharge valve connected to the pump head in parallel with each other such that they protrude from the pump head in this way, the pump is compact on the whole with no protrusion in the direction orthogonal to the central axis, and can advantageously provide a high degree of attaching latitude when it is attached to another device.
- a check valve includes: a body portion having therein a flow path for a liquid; a valve seat portion provided at an entrance side of the flow path of the body portion and having therein a hole through which the liquid flows; a valving element provided in the body portion and able to open and close the hole of the valve seat portion; and a spring provided in the body portion for pressing the valving element into the hole of the valve seat portion.
- the spring has projections, which are formed on an outer circumferential portion of its surface to project toward an inner wall of the body portion.
- the check valve according to the aspect can reduce the sliding resistance of the spring against the inner wall of the body portion.
- FIG. 1 is a perspective diagram showing a reciprocating pump according to one embodiment of the present invention.
- FIG. 2 is a sectional diagram of FIG. 1 taken along a line A-A′.
- FIG. 3 is a partially enlarged sectional diagram showing check valves of the reciprocating pump according to the embodiment and their vicinity.
- FIG. 4A is a plan diagram showing a spring used in the check valves of the reciprocating pump according to the embodiment.
- FIG. 4B is a front diagram showing the spring used in the check valves of the reciprocating pump according to the embodiment.
- FIG. 5 is a perspective diagram showing the spring used in the check valves of the reciprocating pump according to the embodiment.
- the reciprocating pump according to the present embodiment is a diaphragm pump which introduces a liquid into a pump chamber from a tank, etc. through a pipe and a suction valve and discharges the liquid from the pump chamber through a discharge valve and a pipe by reciprocating movement of a drive shaft and a diaphragm driven by an electromagnetic actuation means.
- FIG. 1 is a perspective diagram showing the diaphragm pump according to the present embodiment.
- FIG. 2 is a sectional diagram of FIG. 1 taken along a line A-A′.
- the diaphragm pump 1 according to the present embodiment comprises: a pump head 2 in which a liquid inflow path and a liquid outflow path are formed; and an electromagnetic actuation unit 4 which is attached on the rear side of the pump head 2 and actuates the diaphragm pump 1 .
- the pump head 2 comprises: a pump head body 10 having an attachment portion 11 to which the electromagnetic actuation unit 4 is attached and having therein flow paths 12 a and 12 b which communicate with a pump chamber 6 described later; a suction valve unit 20 attached on the front side of the pump head body 10 to communicate with the flow path 12 a of the pump head body 10 ; and a discharge valve unit 30 attached on the front side of the pump head body 10 in parallel with the suction valve unit 20 to communicate with the flow path 12 b of the pump head body 10 .
- the attachment portion 11 of the pump head body 10 has a recessed portion 13 which defines the pump chamber 6 in cooperation with a diaphragm 80 of the electromagnetic actuation unit 4 described later.
- the suction valve unit 20 comprises: a check valve 21 provided to communicate with the pump chamber 6 through the flow path 12 a of the pump head body 10 ; a joint 22 which supports the check valve 21 and has a screw for attaching to the front side of the pump head body 10 ; and a nut 23 attached on the leading end portion of the joint 22 and used for pipe connection.
- the discharge valve unit 30 is configured like the suction valve unit 20 , and comprises: a check valve 31 provided to communicate with the pump chamber 6 through the flow path 12 b of the pump head body 10 ; a joint 32 which supports the check valve 31 and has a screw; and a nut 33 used for pipe connection.
- the suction valve unit 20 and the discharge valve unit 30 are attached on the front side of the pump head body 10 with O-rings 24 and 34 interposed therebetween respectively.
- FIG. 3 is a partially enlarged sectional diagram showing the check valves 21 and 31 of the diaphragm pump 1 according to the present embodiment and their vicinity. Because the check valve 31 is configured like the check valve 21 , explanation about the check valve 31 is skipped to explain only the check valve 21 .
- the check valve 21 comprises: a body portion 25 having therein a flow path for a flowing liquid; a valve seat portion 26 provided at the entrance side of the flow path of the body portion 25 and having therein a hole 26 a through which a liquid flows; a spherical valving element 27 having a size enough to close the hole 26 a of the valve seat portion 26 ; and a spring 28 which secures a certain back pressure by pressing the valving element 27 against the valve seat portion 26 .
- the body portion 25 and the valve seat portion 26 define a cylindrical space in which the valving element 27 can slightly move, and the valving element 27 and the spring 28 are contained in this cylindrical space.
- the body portion 25 has a restricting portion 25 a, which protrudes toward the inside from the exit side of the flow path for restricting excessive movement of the valving element 27 in the cylindrical space.
- FIG. 4 shows a plan diagram and a front diagram of the spring 28 used in the check valve 21 of the diaphragm pump 1 according to the present embodiment.
- FIG. 5 is a perspective diagram of the spring 28 .
- the spring 28 of the check valve 21 comprises a top end portion 28 a and a bottom end portion 28 b both having an annular shape, and a helical linking portion 28 c which links the top end portion 28 a and the bottom end portion 28 b.
- Resin suitable for the spring 28 may be, for example, PEEK (polyether ether ketone), PC (polycarbonate), POM (polyacetal), etc.
- PEEK polyether ether ketone
- PC polycarbonate
- POM polyacetal
- the top end portion 28 a and the bottom end portion 28 b of the spring 28 have a plurality of projections 29 , which project outward from the surfaces thereof and are formed at approximately 45-degree intervals on the outer circumferential surfaces thereof.
- the linking portion 28 c of the spring 28 has a plurality of projections 29 , which project outward from the surface thereof and are formed at approximately 180-degree intervals on the helical outer circumferential surface thereof.
- the spring 28 formed in this way is contained in the cylindrical space defined by the body portion 25 and the valve seat portion 26 such that the projections 29 formed on the top end portion 28 a, the bottom end portion 28 b, and the linking portion 28 c make point contact with the inner wall of the body portion 25 .
- the electromagnetic actuation unit 4 comprises: a cylindrical frame 40 ; a fixed portion 50 fixed on the frame 40 ; a movable portion 60 movable with respect to the fixed portion 50 ; a magnet coil 70 which actuates the movable portion 60 by a magnetic force; and a diaphragm 80 attached on the front surface 40 a of the frame 40 .
- the electromagnetic actuation unit 4 is connected to a power supply (not shown) and to a control device (not shown) through a connector 7 and a conductive wire 8 .
- the diaphragm 80 has flexibility. Therefore, when the pump head body 10 is attached at its attachment portion 11 to the front surface 40 a of the frame 40 , the circumferential edge portion of the diaphragm 80 is held between the front surface 40 a of the frame 40 and the attachment portion 11 of the pump head body 10 and the front surface of the diaphragm 80 defines the pump chamber 6 in cooperation with the recessed portion 13 of the pump head body 10 .
- the diaphragm 80 is coupled through a diaphragm coupler 62 to the leading end portion of a rod-like plunger 61 configuring the movable portion 60 .
- the plunger 61 is supported in a center hole of a fixed sleeve 51 configuring the fixed portion 50 with a thrust bearing 52 provided between the plunger 61 and the fixed sleeve 51 such that the plunger 61 is freely movable in the axial direction.
- a plunger core 63 is fixed on the rear end of the plunger 61 .
- the plunger core 63 is supported on the fixed portion 50 with a thrust bearing 53 provided therebetween such that the plunger core 63 is freely movable in the axial direction.
- the front surface of the plunger core 63 faces the rear end surface of the fixed sleeve 51 with a certain gap therebetween.
- a return spring 64 is provided between the inner circumferential surface of the fixed sleeve 51 and the outer circumferential surface of the plunger 61 . With the return spring 64 fitted between the front surface of the plunger core 63 and the fixed sleeve 51 , the plunger 61 is always biased rearward through the plunger core 63 .
- An O-ring (not shown) as a shock absorber is provided on the front surface of the plunger core 63 .
- the plunger 61 , the diaphragm coupler 62 , the plunger core 63 , the return spring 64 , and the O-ring configure the movable portion 60 .
- the fixed portion 50 comprises the fixed sleeve 51 supporting the plunger 61 , and a coil holder 54 provided to extend from the fixed sleeve 51 to the plunger core 63 to surround them.
- the coil holder 54 is fitted with the magnet coil 70 .
- the electromagnetic actuation unit 4 is energized by operating the power supply and control device (not shown).
- the magnet coil 70 of the electromagnetic actuation unit 4 is energized, the plunger core 63 is moved frontward by an electromagnetic force.
- the plunger 61 is moved rearward by the spring force of the return spring 64 .
- the control device controls the energization frequency of the magnet coil 70 , thereby controlling the frequency of the reciprocating movement of the plunger 61 .
- the check valve 21 of the suction valve unit 20 is closed and the check valve 31 of the discharge valve unit 30 is opened, thereby discharging the liquid in the pump chamber 6 to a discharge-side hose (not shown) through the flow path 12 b of the pump head body 10 , the check valve 31 , and the joint 32 .
- the check valves 21 and 31 are opened or closed in response to the hole 26 a of the valve seat portion 26 being opened or closed as the spring 28 is contracted or expanded by the fluid pressure or the spring force of the spring 28 aided by the valving element 27 .
- the diaphragm pump according to the present embodiment described above is suitable for downsizing, because it uses the springs 28 in the check valves 21 and 31 and this enables itself to demonstrate a better checking performance in the suction step and the discharge step and thereby improve the pump efficiency.
- the springs 28 are made of resin and thus can be used with no problem even for delivering a chemical liquid having metal corrosivity.
- the diaphragm pump according to the present embodiment can reduce the sliding resistance because the projections 29 are formed on the outer circumference of the springs 28 .
- the suction valve unit 20 and the discharge valve unit 30 are provided on the front surface of the pump head 2 such that they protrude in parallel with the direction of the central axis of the pump head 2 and electromagnetic actuation unit 4 coaxial with the pump head 2 , and such that they are contained inside the range of the outer frame of the pump head 2 and electromagnetic actuation unit 4 , provided that the outer frame is extended in the axial direction of the pump head 2 and electromagnetic actuation unit 4 . Therefore, the pump is compact on the whole with no protrusion in the direction orthogonal to the central axis, and can advantageously provide a high degree of attaching latitude when it is attached to another device.
- the reciprocating pump according to the present embodiment has been a diaphragm pump, but is not limited to this and may be such reciprocating pumps as a bellows pump, a tubephragm pump, etc.
Abstract
A reciprocating pump introduces a liquid into a pump chamber through a suction valve and discharges the liquid from the pump chamber through a discharge valve by reciprocating movement of a reciprocating member facing the pump chamber. The suction valve and the discharge valve include: a body portion having therein a flow path for a liquid; a valve seat portion provided at an entrance side of the flow path of the body portion and having therein a hole through which the liquid flows; a valving element provided in the body portion and able to open and close the hole of the valve seat portion; and a spring provided in the body portion for pressing the valving element into the hole of the valve seat portion. The spring has projections which are formed on an outer circumferential portion of its surface to project toward the inner wall of the body portion.
Description
- This application is based upon and claims the benefit of priority from prior Japanese Patent Application No.2009-239266, filed on Oct. 16, 2009, the entire contents of which are incorporated herein by reference.
- 1. Field
- Embodiments described herein relate to a reciprocating pump which introduces a liquid into a pump chamber from a tank, etc. through a pipe and a suction valve and discharges the liquid from the pump chamber through a discharge valve and a pipe by reciprocating movement of a reciprocating member driven by an actuation means, and a check valve used for the reciprocating pump.
- 2. Description of the Related Art
- Conventionally, in order to prevent backflow, etc. of a liquid to deliver, reciprocating pumps which utilize reciprocating movement of a diaphragm, etc. use, as a suction valve and a discharge valve, check valves comprising a valving element such as a valve ball, etc. which can open and close a liquid flow path (JPH09-203380A). Meanwhile, reciprocating pumps such as electromagnetic pumps, etc. are required to become more accurate and more downsized. However, downsizing of pumps inevitably leads to a reduction of the amount of volumetric change in the pump chamber, which raises an issue of how to realize an efficient pumping operation. In order to improve the pump efficiency, it is effective to improve the checking performance of the suction valve and the discharge valve.
- A reciprocating pump according to one aspect of the invention introduces a liquid into a pump chamber through a suction valve and discharges the liquid from the pump chamber through a discharge valve by reciprocating movement of a reciprocating member facing the pump chamber. The suction valve and the discharge valve each include: a body portion having therein a flow path for a liquid; a valve seat portion provided at an entrance side of the flow path of the body portion and having therein a hole through which the liquid flows; a valving element provided in the body portion and able to open and close the hole of the valve seat portion; and a spring provided in the body portion for pressing the valving element into the hole of the valve seat portion. The spring has projections, which are formed on an outer circumferential portion of its surface to project toward the inner wall of the body portion.
- The reciprocating pump according to the aspect is suitable for downsizing, because the use of a spring in the suction valve and the discharge valve improves the checking performance in the suction step and the discharge step and hence improves the pump efficiency.
- In the reciprocating pump according to the aspect, the spring may be made of resin, which enables the pump to be used with no problem even for delivering a chemical liquid having metal corrosivity.
- In the reciprocating pump according to the aspect, the suction valve and the discharge valve may be connected to a pump head in parallel with each other such that they protrude from the pump head in a direction of a central axis of the pump head. With the suction valve and the discharge valve connected to the pump head in parallel with each other such that they protrude from the pump head in this way, the pump is compact on the whole with no protrusion in the direction orthogonal to the central axis, and can advantageously provide a high degree of attaching latitude when it is attached to another device.
- A check valve according to another aspect of the invention includes: a body portion having therein a flow path for a liquid; a valve seat portion provided at an entrance side of the flow path of the body portion and having therein a hole through which the liquid flows; a valving element provided in the body portion and able to open and close the hole of the valve seat portion; and a spring provided in the body portion for pressing the valving element into the hole of the valve seat portion. The spring has projections, which are formed on an outer circumferential portion of its surface to project toward an inner wall of the body portion.
- By forming projections on the outer circumferential portion of the spring surface, the check valve according to the aspect can reduce the sliding resistance of the spring against the inner wall of the body portion.
- According to the aspect, it is possible to provide a reciprocating pump which can be accurate and downsized. It is also possible to provide a check valve suitable for a reciprocating pump which can be accurate and downsized.
-
FIG. 1 is a perspective diagram showing a reciprocating pump according to one embodiment of the present invention. -
FIG. 2 is a sectional diagram ofFIG. 1 taken along a line A-A′. -
FIG. 3 is a partially enlarged sectional diagram showing check valves of the reciprocating pump according to the embodiment and their vicinity. -
FIG. 4A is a plan diagram showing a spring used in the check valves of the reciprocating pump according to the embodiment. -
FIG. 4B is a front diagram showing the spring used in the check valves of the reciprocating pump according to the embodiment. -
FIG. 5 is a perspective diagram showing the spring used in the check valves of the reciprocating pump according to the embodiment. - Next, a reciprocating pump and a check valve according to one embodiment of the present invention will be explained with reference to the drawings. The reciprocating pump according to the present embodiment is a diaphragm pump which introduces a liquid into a pump chamber from a tank, etc. through a pipe and a suction valve and discharges the liquid from the pump chamber through a discharge valve and a pipe by reciprocating movement of a drive shaft and a diaphragm driven by an electromagnetic actuation means.
-
FIG. 1 is a perspective diagram showing the diaphragm pump according to the present embodiment.FIG. 2 is a sectional diagram ofFIG. 1 taken along a line A-A′. Thediaphragm pump 1 according to the present embodiment comprises: apump head 2 in which a liquid inflow path and a liquid outflow path are formed; and anelectromagnetic actuation unit 4 which is attached on the rear side of thepump head 2 and actuates thediaphragm pump 1. - The
pump head 2 comprises: apump head body 10 having an attachment portion 11 to which theelectromagnetic actuation unit 4 is attached and having thereinflow paths pump chamber 6 described later; asuction valve unit 20 attached on the front side of thepump head body 10 to communicate with theflow path 12 a of thepump head body 10; and adischarge valve unit 30 attached on the front side of thepump head body 10 in parallel with thesuction valve unit 20 to communicate with theflow path 12 b of thepump head body 10. The attachment portion 11 of thepump head body 10 has arecessed portion 13 which defines thepump chamber 6 in cooperation with adiaphragm 80 of theelectromagnetic actuation unit 4 described later. - The
suction valve unit 20 comprises: acheck valve 21 provided to communicate with thepump chamber 6 through theflow path 12 a of thepump head body 10; ajoint 22 which supports thecheck valve 21 and has a screw for attaching to the front side of thepump head body 10; and anut 23 attached on the leading end portion of thejoint 22 and used for pipe connection. Thedischarge valve unit 30 is configured like thesuction valve unit 20, and comprises: acheck valve 31 provided to communicate with thepump chamber 6 through theflow path 12 b of thepump head body 10; ajoint 32 which supports thecheck valve 31 and has a screw; and anut 33 used for pipe connection. Thesuction valve unit 20 and thedischarge valve unit 30 are attached on the front side of thepump head body 10 with O-rings -
FIG. 3 is a partially enlarged sectional diagram showing thecheck valves diaphragm pump 1 according to the present embodiment and their vicinity. Because thecheck valve 31 is configured like thecheck valve 21, explanation about thecheck valve 31 is skipped to explain only thecheck valve 21. Thecheck valve 21 comprises: abody portion 25 having therein a flow path for a flowing liquid; avalve seat portion 26 provided at the entrance side of the flow path of thebody portion 25 and having therein ahole 26 a through which a liquid flows; aspherical valving element 27 having a size enough to close thehole 26 a of thevalve seat portion 26; and aspring 28 which secures a certain back pressure by pressing thevalving element 27 against thevalve seat portion 26. Thebody portion 25 and thevalve seat portion 26 define a cylindrical space in which thevalving element 27 can slightly move, and thevalving element 27 and thespring 28 are contained in this cylindrical space. Thebody portion 25 has a restrictingportion 25 a, which protrudes toward the inside from the exit side of the flow path for restricting excessive movement of thevalving element 27 in the cylindrical space. -
FIG. 4 shows a plan diagram and a front diagram of thespring 28 used in thecheck valve 21 of thediaphragm pump 1 according to the present embodiment.FIG. 5 is a perspective diagram of thespring 28. Thespring 28 of thecheck valve 21 comprises atop end portion 28 a and abottom end portion 28 b both having an annular shape, and a helical linkingportion 28 c which links thetop end portion 28 a and thebottom end portion 28 b. These portions are formed integrally from a resin suitable as a spring material. Resin suitable for thespring 28 may be, for example, PEEK (polyether ether ketone), PC (polycarbonate), POM (polyacetal), etc. As shown inFIG. 4A andFIG. 4B , thetop end portion 28 a and thebottom end portion 28 b of thespring 28 have a plurality ofprojections 29, which project outward from the surfaces thereof and are formed at approximately 45-degree intervals on the outer circumferential surfaces thereof. As shown inFIG. 4B andFIG. 5 , the linkingportion 28 c of thespring 28 has a plurality ofprojections 29, which project outward from the surface thereof and are formed at approximately 180-degree intervals on the helical outer circumferential surface thereof. Thespring 28 formed in this way is contained in the cylindrical space defined by thebody portion 25 and thevalve seat portion 26 such that theprojections 29 formed on thetop end portion 28 a, thebottom end portion 28 b, and the linkingportion 28 c make point contact with the inner wall of thebody portion 25. - As shown in
FIG. 1 , theelectromagnetic actuation unit 4 comprises: acylindrical frame 40; afixed portion 50 fixed on theframe 40; amovable portion 60 movable with respect to thefixed portion 50; amagnet coil 70 which actuates themovable portion 60 by a magnetic force; and adiaphragm 80 attached on thefront surface 40 a of theframe 40. Theelectromagnetic actuation unit 4 is connected to a power supply (not shown) and to a control device (not shown) through aconnector 7 and aconductive wire 8. - The
diaphragm 80 has flexibility. Therefore, when thepump head body 10 is attached at its attachment portion 11 to thefront surface 40 a of theframe 40, the circumferential edge portion of thediaphragm 80 is held between thefront surface 40 a of theframe 40 and the attachment portion 11 of thepump head body 10 and the front surface of thediaphragm 80 defines thepump chamber 6 in cooperation with the recessedportion 13 of thepump head body 10. Thediaphragm 80 is coupled through adiaphragm coupler 62 to the leading end portion of a rod-like plunger 61 configuring themovable portion 60. Theplunger 61 is supported in a center hole of a fixedsleeve 51 configuring the fixedportion 50 with athrust bearing 52 provided between theplunger 61 and the fixedsleeve 51 such that theplunger 61 is freely movable in the axial direction. Aplunger core 63 is fixed on the rear end of theplunger 61. Theplunger core 63 is supported on the fixedportion 50 with athrust bearing 53 provided therebetween such that theplunger core 63 is freely movable in the axial direction. The front surface of theplunger core 63 faces the rear end surface of the fixedsleeve 51 with a certain gap therebetween. Areturn spring 64 is provided between the inner circumferential surface of the fixedsleeve 51 and the outer circumferential surface of theplunger 61. With thereturn spring 64 fitted between the front surface of theplunger core 63 and the fixedsleeve 51, theplunger 61 is always biased rearward through theplunger core 63. An O-ring (not shown) as a shock absorber is provided on the front surface of theplunger core 63. Theplunger 61, thediaphragm coupler 62, theplunger core 63, thereturn spring 64, and the O-ring configure themovable portion 60. - The fixed
portion 50 comprises the fixedsleeve 51 supporting theplunger 61, and acoil holder 54 provided to extend from the fixedsleeve 51 to theplunger core 63 to surround them. Thecoil holder 54 is fitted with themagnet coil 70. - Next, a working of the
diaphragm pump 1 configured in this way will be explained. First, theelectromagnetic actuation unit 4 is energized by operating the power supply and control device (not shown). When themagnet coil 70 of theelectromagnetic actuation unit 4 is energized, theplunger core 63 is moved frontward by an electromagnetic force. When the energization of themagnet coil 70 is stopped, theplunger 61 is moved rearward by the spring force of thereturn spring 64. At this time, the control device controls the energization frequency of themagnet coil 70, thereby controlling the frequency of the reciprocating movement of theplunger 61. - In a suction stroke in which the
diaphragm 80 is moved rearward together with theplunger 61, thepump chamber 6 becomes a negatively-pressured state inside. Therefore, thecheck valve 21 of thesuction valve unit 20 is opened and thecheck valve 31 of thedischarge valve unit 30 is closed, thereby introducing a liquid into thepump chamber 6 from a tank (not shown) through the joint 22, thecheck valve 21, and theflow path 12 a of thepump head body 10. Next, in a discharge stroke in which thediaphragm 80 is moved frontward together with theplunger 61, the fluid pressures in thepump chamber 6 and in theflow path 12 b of thepump head body 10 become higher than the back pressure provided by thespring 28 of thecheck valve 31. Therefore, thecheck valve 21 of thesuction valve unit 20 is closed and thecheck valve 31 of thedischarge valve unit 30 is opened, thereby discharging the liquid in thepump chamber 6 to a discharge-side hose (not shown) through theflow path 12 b of thepump head body 10, thecheck valve 31, and the joint 32. Here, thecheck valves hole 26 a of thevalve seat portion 26 being opened or closed as thespring 28 is contracted or expanded by the fluid pressure or the spring force of thespring 28 aided by thevalving element 27. - The diaphragm pump according to the present embodiment described above is suitable for downsizing, because it uses the
springs 28 in thecheck valves springs 28 are made of resin and thus can be used with no problem even for delivering a chemical liquid having metal corrosivity. - When check valves are used in such
suction valve unit 20 anddischarge valve unit 30 as above, and besides, thesprings 28 are made of resin, there are risks of checking performance deterioration and friction due to the sliding resistance caused by the reciprocating movement. However, the diaphragm pump according to the present embodiment can reduce the sliding resistance because theprojections 29 are formed on the outer circumference of thesprings 28. - In the present embodiment, the
suction valve unit 20 and thedischarge valve unit 30 are provided on the front surface of thepump head 2 such that they protrude in parallel with the direction of the central axis of thepump head 2 andelectromagnetic actuation unit 4 coaxial with thepump head 2, and such that they are contained inside the range of the outer frame of thepump head 2 andelectromagnetic actuation unit 4, provided that the outer frame is extended in the axial direction of thepump head 2 andelectromagnetic actuation unit 4. Therefore, the pump is compact on the whole with no protrusion in the direction orthogonal to the central axis, and can advantageously provide a high degree of attaching latitude when it is attached to another device. - The reciprocating pump according to the present embodiment has been a diaphragm pump, but is not limited to this and may be such reciprocating pumps as a bellows pump, a tubephragm pump, etc.
- While certain embodiments of the inventions have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel methods and systems described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the methods and systems described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fail within the scope and spirit of the inventions.
Claims (4)
1. A reciprocating pump which introduces a liquid into a pump chamber through a suction valve and discharges the liquid from the pump chamber through a discharge valve by reciprocating movement of a reciprocating member facing the pump chamber,
the suction valve and the discharge valve each comprising:
a body portion having therein a flow path for a liquid;
a valve seat portion provided at an entrance side of the flow path of the body portion and having therein a hole through which the liquid flows;
a valving element provided in the body portion and able to open and close the hole of the valve seat portion; and
a spring provided in the body portion for pressing the valving element to the hole of the valve seat portion and having projections which are formed on an outer circumferential portion of its surface, the projections being projecting toward an inner wall of the body portion.
2. The reciprocating pump according to claim 1 , wherein the spring is made of resin.
3. The reciprocating pump according to claim 1 , wherein the suction valve and the discharge valve are connected to a pump head in parallel with each other such that they protrude from the pump head in a direction of a central axis of the pump head.
4. A check valve, comprising:
a body portion having therein a flow path for a liquid;
a valve seat portion provided at an entrance side of the flow path of the body portion and having therein a hole through which the liquid flows;
a valving element provided in the body portion and able to open and close the hole of the valve seat portion; and
a spring provided in the body portion for pressing the valving element to the hole of the valve seat portion and having projections which are formed on an outer circumferential portion of its surface, the projections being projecting toward an inner wall of the body portion.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009-239266 | 2009-10-16 | ||
JP2009239266A JP5513066B2 (en) | 2009-10-16 | 2009-10-16 | Reciprocating pump and check valve |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110091340A1 true US20110091340A1 (en) | 2011-04-21 |
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ID=43796964
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/901,093 Abandoned US20110091340A1 (en) | 2009-10-16 | 2010-10-08 | Reciprocating pump and check valve |
Country Status (3)
Country | Link |
---|---|
US (1) | US20110091340A1 (en) |
JP (1) | JP5513066B2 (en) |
DE (1) | DE102010042523A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103821702A (en) * | 2012-11-02 | 2014-05-28 | 博世汽车柴油系统有限公司 | Diaphragm pump |
CN111587480A (en) * | 2018-02-19 | 2020-08-25 | 未来儿股份有限公司 | Gas purging port |
US10948106B2 (en) * | 2016-09-22 | 2021-03-16 | Suzhou Skywell Healthcare Information Co, Ltd | Split micro-valve |
CN114576142A (en) * | 2020-11-30 | 2022-06-03 | 浙江耀达智能科技股份有限公司 | Direct current vibrating water pump |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6213837A (en) * | 1985-07-11 | 1987-01-22 | Asahi Chem Ind Co Ltd | Polyacetal coiled spring |
US4854558A (en) * | 1988-07-07 | 1989-08-08 | Caldwell Manufacturing Company | Sound deadener for window counterbalance spring |
US4925164A (en) * | 1985-09-16 | 1990-05-15 | General Motors Corporation | Coil spring with guide rollers |
US6024345A (en) * | 1996-09-25 | 2000-02-15 | Nippon Pillar Packing Co., Ltd. | Resin-made spring and a bellows type constant volume pump using the same |
US20030021709A1 (en) * | 2001-07-18 | 2003-01-30 | Akinori Okuya | Plunger pump device |
US20040219044A1 (en) * | 2003-05-02 | 2004-11-04 | Nippon Pillar Packing Co., Ltd. | Reciprocating pump |
US20090234365A1 (en) * | 2006-05-26 | 2009-09-17 | Gross Silver | Dynamometric tool for medical use |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4995529U (en) * | 1972-12-08 | 1974-08-17 | ||
JP2848807B2 (en) | 1996-01-26 | 1999-01-20 | 株式会社イワキ | Reciprocating pump with automatic degassing mechanism |
-
2009
- 2009-10-16 JP JP2009239266A patent/JP5513066B2/en active Active
-
2010
- 2010-10-08 US US12/901,093 patent/US20110091340A1/en not_active Abandoned
- 2010-10-15 DE DE102010042523A patent/DE102010042523A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6213837A (en) * | 1985-07-11 | 1987-01-22 | Asahi Chem Ind Co Ltd | Polyacetal coiled spring |
US4925164A (en) * | 1985-09-16 | 1990-05-15 | General Motors Corporation | Coil spring with guide rollers |
US4854558A (en) * | 1988-07-07 | 1989-08-08 | Caldwell Manufacturing Company | Sound deadener for window counterbalance spring |
US6024345A (en) * | 1996-09-25 | 2000-02-15 | Nippon Pillar Packing Co., Ltd. | Resin-made spring and a bellows type constant volume pump using the same |
US20030021709A1 (en) * | 2001-07-18 | 2003-01-30 | Akinori Okuya | Plunger pump device |
US20040219044A1 (en) * | 2003-05-02 | 2004-11-04 | Nippon Pillar Packing Co., Ltd. | Reciprocating pump |
US20090234365A1 (en) * | 2006-05-26 | 2009-09-17 | Gross Silver | Dynamometric tool for medical use |
Non-Patent Citations (1)
Title |
---|
JP 62013837 A abstract;01-1987,ISHIDA et al., * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103821702A (en) * | 2012-11-02 | 2014-05-28 | 博世汽车柴油系统有限公司 | Diaphragm pump |
US10948106B2 (en) * | 2016-09-22 | 2021-03-16 | Suzhou Skywell Healthcare Information Co, Ltd | Split micro-valve |
CN111587480A (en) * | 2018-02-19 | 2020-08-25 | 未来儿股份有限公司 | Gas purging port |
US11448330B2 (en) | 2018-02-19 | 2022-09-20 | Miraial Co., Ltd. | Gas purge port |
CN114576142A (en) * | 2020-11-30 | 2022-06-03 | 浙江耀达智能科技股份有限公司 | Direct current vibrating water pump |
Also Published As
Publication number | Publication date |
---|---|
JP5513066B2 (en) | 2014-06-04 |
DE102010042523A1 (en) | 2011-04-28 |
JP2011085087A (en) | 2011-04-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: IWAKI CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SUNAGAWA, KEIZO;REEL/FRAME:025641/0546 Effective date: 20101124 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |